Patent application number | Description | Published |
20090261868 | HARMONIC SUPPRESSION CIRCUIT, AN INJECTION-LOCKED FREQUENCY DIVIDER CIRCUIT AND ASSOCIATED METHODS - The invention includes a harmonic suppression circuit, an injection-locked frequency divider circuit (ILFD) and associated methods. The harmonic suppression circuit comprises a source voltage, two suppression modules, two input terminals, two smoothed output terminals and a ground. The ILFD comprises a ground, an input transistor, an input terminal, two divider legs, two output terminals and a source voltage. The associated method to improve harmonic suppression comprises acts of synthesizing differential-phase signals and simultaneously suppressing second harmonics of in-phase signals. The method to extent an ILFD's locking range comprises acts of decreasing quality factor while keeping resonance frequency constant. | 10-22-2009 |
20100271082 | MULTIMODE MILLIMETER-WAVE FREQUENCY DIVIDER CIRCUIT WITH MULTIPLE PRESETTABLE FREQUENCY DIVIDING MODES - A multimode millimeter-wave frequency divider circuit with multiple selectable frequency dividing modes is proposed, which is designed for integration with a millimeter wave (MMW) circuit system, such as a phase-locked loop (PLL) circuit, for providing multimode frequency dividing functions. In actual application, the millimeter wave frequency divider circuit of multi frequency dividing mode provides at least three frequency dividing operational modes, including modes of dividing two, dividing 3 and dividing four. In practice, the millimeter wave frequency divider circuit of multi frequency divider mode may be integrated with a millimeter wave phase-locked circuit to provide a frequency synthetic function having multi frequency sections, such as including 38 GHZ, 60 GHZ and 77 GHZ, and may use reduced circuit layout surfaces and operational power. | 10-28-2010 |
Patent application number | Description | Published |
20120223779 | Voltage-controlled oscillator - This invention provides a voltage-controlled oscillator, comprising a first voltage-controlled oscillator circuit and a second voltage-controlled oscillator circuit. The first voltage-controlled oscillator circuit comprises a plurality of inductors, a plurality of variable capacitors, and a plurality of MOS transistors. The circuit configuration of the second voltage-controlled oscillator circuit is symmetrical to that of the first voltage-controlled oscillator circuit. The inductors of the first voltage-controlled oscillator circuit are cross-coupled to the inductors of the second voltage-controlled oscillator circuit. | 09-06-2012 |
20140120846 | MIXER - A mixing unit includes a baseband signal processing unit, a radio frequency (RF) signal processing unit and a mixing unit. The baseband signal processing unit receives or generates a baseband signal. The RF signal processing unit processes or outputs a RF signal. The mixing unit is coupled to the baseband signal processing unit and the RF signal processing unit to select and operate in an up-convert mode or a down-convert mode according to a control signal. When the mixer operates in an up-convert mode, the mixing unit mixes the baseband signal with a local oscillation signal to generate the RF signal and outputs the RF signal to the RF signal processing unit. When the mixer operates in a down-convert mode, the mixing unit mixes the RF signal with the local oscillation signal to generate the baseband signal and outputs the baseband signal to the baseband signal processing unit. | 05-01-2014 |
20140152394 | FREQUENCY DETECTION CIRCUITS, RADIO FREQUENCY SIGNAL PROCESSING DEVICES AND METHODS FOR CALIBRATING INDUCTANCE AND CAPACITANCE - A frequency detection circuit includes a filter, a power detector and a voltage comparator. The filter receives and filters a converted signal to generate a filtered signal. The power of the filtered signal relates to a frequency of the converted signal. The power detector generates a voltage according to the power of the filtered signal. The voltage comparator compares the voltage with multiple reference voltages to generate multiple comparison results. At least one of the inductance and capacitance of an LC tank in an amplifier is adjusted according to the comparison results. | 06-05-2014 |
Patent application number | Description | Published |
20120249186 | SINGLE-TO-DIFFERENTIAL CONVERSION CIRCUIT - A single-to-differential conversion circuit includes a first transistor, a second transistor, and a transforming unit. Each of the first and second transistors has first, second and third terminals. The trans forming unit has first, second, and third induction elements. The first induction element has a first inductive terminal coupled to the second terminal of the first transistor, and a second inductive terminal coupled to a voltage source. The second induction element has a first inductive terminal to be coupled to the voltage source, and a second inductive terminal coupled to the second terminal of the second transistor. The third induction element has a first inductive terminal coupled to the first terminals of the first and second transistors, and a second inductive terminal coupled to ground. The third induction element electrically couples to the first and the second induction elements according to first and second coupling parameters, respectively. | 10-04-2012 |
20120286857 | SWITCHED CAPACITOR CIRCUIT WITH SWITCHING LOSS COMPENSATION MECHANISM AND COMPENSATION METHOD THEREOF - A switched capacitor circuit with switching loss compensation mechanism includes a resonant unit and a loss compensation unit. The resonant unit generates a resonant frequency and includes a capacitor switching unit for switching an output capacitor. The loss compensation unit is coupled to the resonant unit for providing loss compensation when the capacitor switching unit outputs different capacitance values. | 11-15-2012 |
20130278320 | MIXER FOR MIXING INPUT SIGNAL WITH MULTIPLE OSCILLATING SIGNALS HAVING DIFFERENT PHASES AND RELATED MIXING METHOD THEREOF - A mixer includes a transformer and a mixing circuit. The transformer is employed for receiving an input signal to generate a differential output. The mixing circuit is coupled to the transformer, and employed for mixing the differential output with N oscillating signals having different phases to generate a plurality of mixed output signals, wherein N is greater than 2. | 10-24-2013 |
20130307620 | SIGNAL AMPLIFYING CIRCUIT WITH REDUCED OUTPUT SIGNAL NOISE BY INTRODUCING COUPLING EFFECT AND RELATED METHOD THEREOF - A signal amplifying circuit includes: an input stage circuit, arranged to receive an input signal; a first inductive device coupled between the input stage circuit and a first reference voltage; an output stage circuit arranged to generate an output signal according to the input signal; and a second inductive device coupled between the output stage circuit and a second reference voltage, wherein at least a part of a winding of the first inductive element is cross-coupled to at least a part of a winding of the second inductive element. | 11-21-2013 |
20140022018 | AMPLIFIER WITH GAIN CIRCUIT COUPELD TO PRIMARY COIL OF TRANSFORMER - An amplifier includes a transformer and a first stage gain circuit. The transformer includes a primary coil and a secondary coil. The primary coil is utilized for receiving an input signal. The first stage gain circuit has a first input port, which is coupled to the primary coil. The first stage gain circuit is utilized for gaining the input signal so as to generate a first output. | 01-23-2014 |
20140049441 | SIGNAL CONVERTING CIRCUIT CAPABLE OF REDUCING/AVOIDING SIGNAL LEAKAGE AND RELATED SIGNAL CONVERTING METHOD - A signal converting circuit includes: a first switching circuit; a second switching circuit; and a first balance-unbalance circuit (Balun) having a first signal terminal coupled to an antenna, a second signal terminal coupled to the first switching circuit, and a third signal terminal coupled to the second switching circuit; wherein when the first balance-unbalance circuit operates in a first signal converting mode, the first switching circuit and the second switching circuit are arranged to couple the second signal terminal and the third signal terminal, respectively, to a first signal processing circuit, and when the first balance-unbalance circuit does not operate in the first signal converting mode, the first switching circuit and the second switching circuit are arranged to couple the second signal terminal and the third signal terminal, respectively, to a reference voltage. | 02-20-2014 |