UNIBAND ELECTRONIC CORP. Patent applications |
Patent application number | Title | Published |
20150263670 | Frequency Modulation Based on Two Path Modulation - A two path direct frequency modulation system is disclosed. The system includes a Varactor, a voltage-controlled oscillator (VCO) calibration capacitor bank including a first plurality of switchable capacitors, and a frequency deviation capacitor bank including a second plurality of switchable capacitors. The method includes switching on or off a number of the first plurality of switchable capacitors to obtain a desired frequency band and determining number of cycles within a first predetermined time to obtain a first count, switching on or off a number of the first plurality of switchable capacitors or of the second plurality of switchable capacitors to change the desired frequency band and determining number of cycles within a second predetermined time to obtain a second count, and modulating a data signal by switching on or off a switchable capacitors of the second plurality of switchable capacitors according to the first and the second count. | 09-17-2015 |
20150063504 | Digital Receiver System Activated by RSSI Signal - A digital receiver includes a radio frequency analog front end, a digital processing unit, a plurality of cascaded amplifier stages configured to receive output of the radio frequency analog front end, a first analog to digital converter configured to convert an analog signal output from the plurality of cascaded amplifier stages into a digital signal output to the digital processing unit, a first received signal strength indicator unit configured to receive outputs of each of the plurality of cascaded amplifier stages and output signal to the digital processing unit, a second received signal strength indicator unit configured to receive output of at least one amplifier stage in the plurality of cascaded amplifier stages, and a received signal strength indicator detection unit configured to activate and to deactivate digital units according to a comparison of output from the second received signal strength indicator unit to a predetermined threshold. | 03-05-2015 |
20140073278 | RSSI estimation based on VGA control and threshold detection - A circuit for RSSI estimation includes a cascaded chain of variable gain amplifier stages, a threshold detector configured to output an indication signal according to a comparison of output of the cascaded chain of variable gain amplifier stages with a predetermined threshold, and an automatic gain controller configured to adjust gain of at least one variable gain amplifier of the cascaded chain of variable gain amplifier stages according to the indication signal. Each stage may include a switch module configured to electrically connect or disconnect an input of the variable gain amplifier of the at least one variable gain amplifier stage to/from an output of a previous variable gain amplifier stage according to a switch control signal. | 03-13-2014 |
20120176202 | Frequency Synthesizer with Built-in Carrier and Crystal Oscillation Frequency Offset Cancellation - A frequency synthesizer of a transceiver for generating a crystal oscillation frequency and a carry frequency having been done a process of frequency offset cancellation with that of another transceiver. The frequency offset cancellation of the frequency synthesizer is done in accordance with a wireless signal which is transmitted from another transceiver received. The frequency synthesizer has a first sigma-delta modulator receiving a signal transmitted by a transceiver at far area responding thereafter a frequency divisor value in accordance with the channel information of the received signal and a frequency offset between two. | 07-12-2012 |
20110292982 | Method of Using Average Phase Difference to Measure a Distance and Apparatus for the Same - Apparatus for positioning and method for the same are disclosed. The apparatus comprises two transceivers and four time-to-digital converters. The time-to-digital converters compare the phase difference between two signals, one is the crystal oscillation and the other is the phase of the IF (intermediate frequency) signal extracted before ADC receiving by the transceiver. The method comprises the following steps: The first place transmits a first wireless signal by a first transceiver to the second place. The second place then responds a second wireless signal by a second transceiver to the first place. The first phase difference at the first place is then measured by the time-to-digital converter. The second phase difference at the second place is also measured. The distance between the first place and the second place is proportional to one half of the sum of first phase difference and the second phase difference. | 12-01-2011 |
20100272261 | Data Security Transmission Wirelessly with Zigbee Chips - A wireless network system for data transmitting securely is disclosed. The system comprises a central control end for generating a cipher password per predetermined time unit. The central control end has a first Zigbee chip, a computer terminal for a user to input parameters, and a cryptographic algorithm program provided wherein the cryptographic algorithm program and the parameters are provided for password encryption using the cryptographic algorithm program is run by a microprocessor of the first Zigbee chip. The system also comprises a data transmitting end and a several data receiving ends. The data transmitting end using the Zigbee decrypts the cipher password and encrypts the data file using the plain password and the Zigbee chip. The data receiving ends using the Zigbee decrypt the cipher password and decrypt the cipher data file into plain data file by the WiFi chips using plain password. | 10-28-2010 |
20090021317 | CMOS cross-coupled differential voltage controlled oscillator - A CMOS cross-coupled differential voltage controlled oscillator is provided with a pair of oscillator outputs. The oscillator includes a current control unit, a first cross-coupled differential pair, an inductor unit, a capacitor unit, a second cross-coupled differential pair and a voltage controller. The current control unit is coupled between a relatively-high voltage and a relatively-low voltage. The first cross-coupled differential pair, the inductor unit, the capacitor unit and the second cross-coupled differential pair are coupled between the pair of oscillator outputs. According to the present invention, the inductor unit is provided with a midway node. The voltage controller is coupled and powered by the midway node. | 01-22-2009 |