A harmonic rejection mixer that uses switched capacitors for amplitude control and uses two different duty cycle local oscillator (LO) signals for phase control for each harmonic. The harmonic rejection mixer uses 2-vector variable duty harmonic rejection. which allows for the harmonic rejection mixer to be less complex. consume less power, and/or use less components/space compared to conventional harmonic rejection mixers.

A switching circuit includes a transmission gate, two base control sub-circuits each including a first transistor and a second transistor, a third transistor, and a fourth transistor. The transmission gate includes two I/O terminals, two gate control terminals, and two base control terminals, and is configured to conduct or not conduct the two I/O terminals according to the voltage of the two gate control terminals. The two base voltage control sub-circuits, the third transistor and the fourth transistor forms a double balance circuit structure and is electrically connected to the transmission gate. The double balance circuit changes the voltage of the base control terminals according to the voltage of the I/O terminals of the transmission gate.

A mixer with a filtering function and a method for linearization of the mixer are provided. The mixer includes at least one amplifier, a transconductance device and a feedback network. The at least one amplifier is configured to output a filtered voltage signal according to an input voltage signal. The transconductance device is coupled to the at least one amplifier, and is configured to generate a filtered current signal according to the filtered voltage signal. The feedback network is coupled between any output terminal among at least one output terminal of the transconductance device and an input terminal of the at least one amplifier. More particularly, the mixer is configured to output a modulated signal according to the filtered current signal.

A passive mixer may include an output coupled to a next stage circuit. The output may be coupled to baseband inputs via first switches. The passive mixer may further include a tunable capacitor bank. The tunable capacitor bank may be coupled via second switches to the baseband inputs.

A mixer includes a transconductance circuit and a mixing circuit. The transconductance circuit includes a capacitor and first and second transconductance modules. The first transconductance module converts a single-ended to-be-shifted voltage signal at a first terminal of the capacitor into a first input current signal. The second transconductance module converts a voltage signal at a second terminal of the capacitor into a second input current signal that cooperates with the first input current signal to constitute a differential input current signal pair. The mixing circuit mixes the differential input current signal pair with a differential oscillatory voltage signal pair to generate a differential mixed voltage signal pair.

A differential mixer and a method which can reduce a leak component of a local oscillation differential signal are provided. A differential mixer includes a mixer core unit to which a high frequency signal and a local oscillation differential signal are inputted and which outputs an intermediate frequency differential signal, a common feedback unit which applies a bias voltage to a signal electrically coupled to the high frequency signal and to which a common voltage is fed back from the intermediate frequency differential signal, and a bias unit that applies a reference voltage to the common feedback unit. The common feedback unit generates the bias voltage based on the reference voltage. The bias unit controls the reference voltage so that a leak component of the local oscillation differential signal is a predetermined value or less at an output end of the intermediate frequency differential signal.

An electronic circuit includes adjustment units configured to receive a same oscillating signal having a predetermined frequency and to adjust a phase and an amplitude of the oscillating signal to produce output oscillating signals, coupling points configured to supply the output oscillating signals produced by the adjustment units to antennas, couplers provided in one-to-one correspondence with outputs of the adjustment units, equal-length lines sharing the same length and extending from the couplers, respectively, mixer circuits coupled to the equal-length lines, respectively, each of the mixer circuits being configured to receive a same reference oscillating signal having the predetermined frequency and a corresponding one of the output oscillating signals, and a control circuit configured to cause the adjustment units to adjust at least one of the phase and the amplitude in response to direct-current components in outputs of the mixer circuits.

A voltage feed-forward circuit, a multiplier using the voltage feed-forward circuit, and a power factor correction circuit using the multiplier. The voltage feed-forward circuit is used to maintain and output a peak voltage (Vff) of an input voltage (Vin), and includes first switch element (S1), a logic control unit (U1), a second switch element (S2), a first capacitor (C1), a third switch element (S3) and a second capacitor (C2). The first control signal (1) and the second control signal (2) begin to be provided at the same time, and the first control signal (1) stops being provided when a voltage of the second end of the first capacitor (C1) is greater than the peak voltage (Vff) of the input voltage (Vin).

The present technology relates to a modulator and a modulation method for enabling provision of a highly convenient modulator. The modulator is configured to be input a first signal corresponding to one of a positive signal and a negative signal constituting a baseband signal of a differential signal, and a second signal having the same level as the first signal in one of an H level section in which the one signal is at an H level and an L level section in which the one signal is at an L level, and configured to generate a modulation signal obtained by modulating a carrier with the first and second signals to generate a modulation signal that is the amplitude shift keying (ASK)-modulated carrier with the baseband signal. The present technology can be applied to a case of modulating a carrier according to a baseband signal, for example.

A circuit having a first Gilbert cell mixer of a first type configured to receive phases of first and second signals and output a first current pair to a first node and a second node; a first Gilbert cell mixer of a second type configured to receive output a second current pair to the first node and the second node; a second Gilbert cell mixer of the first type configured to receive phases of the first and second signals and output a third current pair to the first node and the second node; a second Gilbert cell mixer of the second type configured to output a fourth current pair to the first node and the second node; a cross-coupling inverter pair configured to cross couple the first node and the second node; and a load placed across the first node and the second node and configured to resonate at a frequency approximately equal to either a sum of a frequency of the first signal and a frequency of the second signal or a difference of the frequency of the first signal and the frequency of the second signal.