In certain aspects, a clock generation circuit couples to a first clock having a first duty cycle and a second clock having the first duty cycle. The second clock lags the first clock by 90 degrees in phase. The clock generation circuit is configured to couple the output terminal to a ground when the first clock and the second clock both are at logic high and decouple the output terminal from the ground when at least one of the first clock and the second clock is at logic low and couple a supply voltage to the output terminal only when the first clock is at logic low and decouple the supply voltage from the output terminal when the first clock is at logic high. The clock generation circuit generates clock signals having a second duty cycle.

A frequency multiplier, which may include multiple commutator cells, for multiplying an input signal is provided. A frequency doubler is provided that includes at least one transformer. Each of the at least one transformer includes a primary and a secondary. Each secondary includes a center tap. The frequency doubler further includes at least one commutator cell. Each of the at least one commutator cell includes a first differential pair of input terminals and a second differential pair of input terminals. Each primary is connected to the first pair of differential input terminals and each secondary is connected to the second differential pair of input terminals. The frequency doubler further includes at least one current source and at least one ground. The center tap is connected to the at least one ground via the at least one current source.

Embodiments of power efficient radio frequency mixers are provided. A generalized impedance matched low-voltage active mixer circuit technique, which utilizes a plurality of commutator cells and transformers, is disclosed. The active mixer techniques are reconfigurable between various operation configurations based, at least in part, on selectively activating at least one of a plurality of commutator cells. The low voltage active mixer function is coupled to an impedance matched amplifier which can be bypassed allowing changes in the gain of the mixer circuit suites while preserving impedance matching.

Techniques that facilitate reconfigurable transmission of a radar frequency signal are provided. In one example, a system includes a signal generator and a power modulator. The signal generator provides a radar waveform signal from a set of radar waveform signals. The power modulator divides a local oscillator signal associated with a first frequency and a first amplitude into a first local oscillator signal and a second local oscillator signal. The power modulator also generates a radio frequency signal associated with a second frequency and a second amplitude based on the radar waveform signal, the first local oscillator signal and the second local oscillator signal.

A radio receiver device is arranged to receive an input voltage signal at an input frequency and comprises: a first amplification circuit portion; a second amplification circuit portion; a current buffer circuit portion; and a down-mixer circuit portion. The first amplification circuit portion is arranged to amplify the input voltage signal to generate an amplified current signal which is input to the current buffer circuit portion. The current buffer circuit portion has an input impedance and an output impedance, wherein the output impedance is greater than the input impedance and is arranged to generate a buffered current signal. The down-mixer circuit portion is arranged to receive the buffered current signal and generate a down-converted current signal at a baseband frequency. The second amplification circuit portion is arranged to amplify the down-converted current signal to produce an output voltage signal.

Systems and methods are disclosed for improved linearity performance of a mixer. An example mixer includes switching circuit elements configured to be switched on and switched off based at least partly on a local oscillator signal and capacitors including a respective capacitor in parallel with each of the switching elements. The mixer is configured to mix the input signal with the local oscillator signal to thereby frequency shift the input signal.

Systems, methods, and circuitries are provided for a local oscillator (LO) signal distribution. An exemplary LO distribution network includes a common LO buffer configured to buffer an LO signal, a receive (RX) LO buffer, and a transmit (TX) mixer in a cascaded arrangement. The RX LO buffer is configured to receive the LO signal and buffer the LO signal and to provide the LO signal to an RX mixer. A first LO signal line and a second LO signal line are configured to conduct the LO signal from the common LO buffer to the RX LO buffer. The RX LO buffer is coupled to the first LO signal line and the second LO signal line. The TX mixer is also coupled to the first LO signal line and the second LO signal line.

A method for manufacturing a semiconductor device includes forming one or more fins extending in a first direction over a substrate. The one or more fins include a first region along the first direction and second regions on both sides of the first region along the first direction. A dopant is implanted in the first region of the fins but not in the second regions. A gate structure overlies the first region of the fins and source/drains are formed on the second regions of the fins.

A unit cell for a resistive mixer includes a plurality of active devices arranged in series, wherein each of said plurality of active devices having a different output conductance. A resistive mixer includes a plurality of active devices connected in series with one another to form a unit cell.

The disclosure relates to technology for an apparatus having a current conveyer comprising a first stage having a first differential input, and a second stage having a second differential input. The first and second stages are configured to operate in a push-pull mode to provide an output signal at a current conveyer output between the first stage and the second stage. The apparatus has a first frequency mixer configured to generate a first mixer signal based on an input signal and an oscillator signal having a first frequency. The first frequency mixer is configured to provide the first mixer signal to the first differential input. The apparatus has a second frequency mixer configured to generate a second mixer signal based on the input signal and a second oscillator signal having the first frequency. The second frequency mixer is configured to provide the second mixer signal to the second differential input.