Patent application number | Description | Published |
20090322418 | DISCRETE TIME MULTI-RATE ANALOG FILTER - A discrete time analog filter suitable for use in a receiver and other electronics devices is described herein. In one exemplary design, an apparatus may include a transconductance amplifier, a sampler, and a discrete time analog filter. The transconductance amplifier may amplify a voltage input signal and provide an analog signal. The sampler may sample the analog signal and provide analog samples at a sampling rate. The discrete time analog filter may filter the analog samples and provide filtered analog samples either at the sampling rate for a non-decimating filter or at an output rate that is lower than the sampling rate for a decimating filter. The discrete time analog filter may also filter the analog samples with either equal weights for a rectangular filter or at least two different weights for a weighted filter. | 12-31-2009 |
20100093288 | METHOD AND APPARATUS FOR FACILITATING POWER CONSERVATION VIA TIME-GATING IN A WIRELESS COMMUNICATION SYSTEM - The described apparatus and methods may include a receiver configured to receive a control signal, and a controller configured to regulate power consumption of the receiver during intervals of less than one radio frame based on the control signals. The controller may also be configured to regulate power consumption of a transmitter during intervals of less than one radio frame based on the control signal. | 04-15-2010 |
20100167685 | DISCRETE TIME RECEIVER - A discrete time receiver includes a low noise transconductance amplifier (LNTA), a discrete time sampler, a passive discrete time circuit, and a switched capacitor amplifier. The LNTA amplifies a received RF signal and provides an amplified RF signal. The discrete time sampler samples the amplified RF signal (e.g., with multiple phases of a sampling clock) and provides first analog samples. The passive discrete time circuit decimates and filters the first analog samples and provides second analog samples. The switched capacitor amplifier amplifies the second analog samples and provides third analog samples. The discrete time receiver may further include a second passive discrete time circuit, a second switched capacitor amplifier, and an analog-to-digital converter (ADC) that digitizes baseband analog samples and provides digital samples. The discrete time receiver can flexibly support different system bandwidths and center frequencies. | 07-01-2010 |
20110040818 | DISCRETE TIME LOWPASS FILTER - A discrete time (DT) lowpass filter having various advantages is described. In an exemplary design, the DT lowpass filter includes a decimating DT filter (which may include a passive DT FIR filter and/or a passive DT IIR filter) and an active DT filter. The decimating DT filter receives a first DT signal at a first sample rate, filters and decimates the first DT signal by a factor of N, and provides a second DT signal at a second sample rate lower than the first sample rate. N may be greater than one. The active DT filter filters the second DT signal and provides a third DT signal at the second sample rate. A sampler samples a continuous time signal and provides the first DT signal. The sampler may further double the voltage of the first DT signal relative to the voltage of the continuous time signal. | 02-17-2011 |
20110069749 | NONLINEAR EQUALIZER TO CORRECT FOR MEMORY EFFECTS OF A TRANSMITTER - Techniques for correcting for memory effects of a transmitter are described. In an exemplary design, a receiver obtains input samples including a desired signal transmitted by a transmitter having memory effects. The receiver performs nonlinear equalization on the input samples to obtain first equalized samples, performs linear equalization on the input samples to obtain second equalized samples, and determines output samples based on the first and second equalized samples. The nonlinear equalization corrects for the memory effects and nonlinearities of the transmitter and possibly nonlinearities and memory effects of the receiver. The receiver may jointly determine coefficients for both linear and nonlinear equalization based on an adaptive algorithm. The receiver processes (e.g., demodulates and decodes) the output samples to recover data sent in the desired signal by the transmitter. | 03-24-2011 |
20120140860 | NON-LINEAR ADAPTIVE SCHEME FOR CANCELLATION OF TRANSMIT OUT OF BAND EMISSIONS - A method and apparatus for a non-linear adaptive scheme for transmit out of band emission cancellation is provided. Embodiments disclosed herein provide a method for removing unwanted transmitter emissions from a composite received signal. The method performs the steps of: extracting the I and Q samples from a modulator output; inputting the I and Q samples to a non-linear filter; applying weights to the non-linear filter outputs, combining the non-linear filter outputs to generate a broadband emission estimate; selecting a portion of a transmit emission in a desired portion of a receive band; subtracting an output of the non-linear filter from a composite signal; and feeding back a residual error to the non-linear filter; adapting the non-linear filter iteratively. | 06-07-2012 |
20120230176 | RECEIVE BAND NOISE CANCELLATION METHOD AND APPARATUS - A method and apparatus for eliminating receive band noise in a communication system is provided. The method comprises sensing a transmit signal at a receive frequency, wherein the signal sensed is a bleed over signal from a transmit signal. The sensed bleed over signal is then digitized using a secondary receiver. This secondary receiver utilizes a separate path from the primary receive path. The next step in the method is to estimate the linear distortion, delay, attenuation in the sensed bleed over signal. Next, compensation for the linear distortion, delay, and attenuation are performed on the sensed bleed over signal. The sensed, digitized, and compensated bleed over signal is then cancelled from the primary receive path. | 09-13-2012 |
20120276887 | DEVICE MANUFACTURING USING THE DEVICE'S EMBEDDED WIRELESS TECHNOLOGY - Embodiments describe manufacturing, programming, testing, and servicing of wireless computing devices utilizing their embedded wireless technology. An embodiment method ensures that the wireless computing devices are successfully programmed in the event a disruption to the manufacturing, programming, testing and servicing process flow occurs. The method includes retrieving a last known location of the wireless device before the disruption event and comparing the last known location with the location of the wireless of the wireless device after the disruption event. A wireless device may be returned to the last known location before the disruption event if there is a difference in locations. The programming at the last known location before the disruption event occurred may be successfully completed. Further embodiments include configuring the manufacturing, programming, testing, and servicing of wireless computing devices utilizing the embedded wireless technology in the device based on a reported location of the device within a facility. | 11-01-2012 |
20120286869 | CURRENT BUFFER - A current filtering current buffer amplifier includes: a first port and a second input port configured to be coupled to and receive input current; a first output port and a second output port configured to be coupled to and provide current to a load; a buffer configured to transfer the received input current to the first and second output ports as an output current, the buffer having an input impedance and an output impedance where the output impedance is higher than the input impedance, the buffer including first and second amplifiers, the first amplifier being a common mode feedback amplifier; and a filter coupled to the first and second input ports and coupled to the first and second amplifiers, the filter having a complex impedance and being configured to notch filter the received input current. | 11-15-2012 |
20120286874 | POSITIVE FEEDBACK COMMON GATE LOW NOISE AMPLIFIER - A Positive Feedback Common Gate Low Noise Amplifier (PFCGLNA) has positive feedback transistors and input transistors that are of the same conductivity type. Making the positive feedback and input transistors of the same conductivity type reduces sensitivity to process variations. Noise generated by the positive feedback transistors is used to cancel noise generated by the input transistors. In one embodiment, the PFCGLNA: 1) is tunable to have a substantially constant input impedance for any frequency in a wideband frequency range from 680 MHz to 980 MHz, and 2) has a noise figure less than 2.2 dB over the entire wideband frequency range. The input impedance of the PFCGLNA can be tuned to match a source that drives the PFCGLNA by setting a multi-bit digital control value supplied to a digitally-programmable tank load of the LNA. | 11-15-2012 |
20130040555 | ROBUST SPUR INDUCED TRANSMIT ECHO CANCELLATION FOR MULTI-CARRIER SYSTEMS SUPPORT IN AN RF INTEGRATED TRANSCEIVER - A method and apparatus for eliminating transmit echo spurs is provided. The method includes the steps of: estimating a distortion effect applied to a transmit signal by a duplexer stop band. Next, the contribution of a primary component of the spur is estimated. An image component of the spur is estimated after the primary contribution has been estimated. The transmit echo is then subtracted from the composite desired signal by digitally subtracting the distortion effect, the primary component of the spur, and the image component of the spur, producing the desired composite transmit signal without the transmit echo. | 02-14-2013 |
20130335291 | DUAL/WIDEBAND TERMINATION FOR HYBRID TRANSFORMER - A wireless device is described. The wireless device includes an antenna. The wireless device also includes a hybrid transformer. The wireless device further includes a frequency matching termination port. The frequency matching termination port provides impedance matching with the antenna at multiple frequencies. The frequency matching termination port may include multiple resistors, inductors and capacitors that can be switched in/out. | 12-19-2013 |
20140082038 | Passive switched-capacitor filters conforming to power constraint - Passive switched-capacitor (PSC) filters are described herein. In one design, a PSC filter implements a second-order infinite impulse response (IIR) filter with two complex first-order IIR sections. Each complex first-order IIR section includes three sets of capacitors. A first set of capacitors receives a real input signal and an imaginary delayed signal, stores and shares electrical charges, and provides a real filtered signal. A second set of capacitors receives an imaginary input signal and a real delayed signal, stores and shares electrical charges, and provides an imaginary filtered signal. A third set of capacitors receives the real and imaginary filtered signals, stores and shares electrical charges, and provides the real and imaginary delayed signals. In another design, a PSC filter implements a finite impulse response (FIR) section and an IIR section for a complex first-order IIR section. The IIR section includes multiple complex filter sections operating in an interleaved manner. | 03-20-2014 |
20140082040 | Passive switched-capacitor filters conforming to power constraint - Passive switched-capacitor (PSC) filters are described herein. In one design, a PSC filter implements a second-order infinite impulse response (IIR) filter with two complex first-order IIR sections. Each complex first-order IIR section includes three sets of capacitors. A first set of capacitors receives a real input signal and an imaginary delayed signal, stores and shares electrical charges, and provides a real filtered signal. A second set of capacitors receives an imaginary input signal and a real delayed signal, stores and shares electrical charges, and provides an imaginary filtered signal. A third set of capacitors receives the real and imaginary filtered signals, stores and shares electrical charges, and provides the real and imaginary delayed signals. In another design, a PSC filter implements a finite impulse response (FIR) section and an IIR section for a complex first-order IIR section. The IIR section includes multiple complex filter sections operating in an interleaved manner. | 03-20-2014 |
20140247757 | MULTI-TAP ADAPTIVE FILTER FOR TRANSMIT SIGNAL LEAKAGE CANCELLATION - Exemplary embodiments are directed to systems, devices, and methods for mitigating effects of transmit signal leakage. A transceiver may include a transmitter and a receiver. The transceiver may further include a multi-tap analog adaptive filter coupled to each of the transmitter and the receiver and configured to generate an estimated transmit leakage signal based on at least a portion of a transmit signal from the transmitter and an error signal from the receiver. | 09-04-2014 |
20140254448 | METHOD AND APPARATUS FOR FACILITATING POWER CONSERVATION VIA TIME-GATING IN A WIRELESS COMMUNICATION SYSTEM - The described apparatus and methods may include a receiver configured to receive a control signal, and a controller configured to regulate power consumption of the receiver during intervals of less than one radio frame based on the control signals. The controller may also be configured to regulate power consumption of a transmitter during intervals of less than one radio frame based on the control signal. | 09-11-2014 |