A radio frequency (RF) mixer is provided. The RF mixer includes two linear-in-the-amplitude-domain RF channels connected in parallel, with each of the two linear-in-the-amplitude-domain RF channels having of an input RF signal applied equally to each channel. Two controllable gain devices are structured to receive the input RF signal. A local oscillator (LO) communicates with both of the controllable gain devices, with one of the controllable gain devices receiving a signal from the LO directly, and the other controllable gain device receiving a signal from the LO after a phase of the LO signal is reversed by a phase inverter. Finally, an output of each of the linear-in-the-amplitude-domain RF channels is combined to form a common intermediate frequency (IF) output.

A configurable radio frequency receiver is provided. The receiver has at least one low noise amplifier; an oscillator arrangement for producing a plurality of signals having a first number or a second number of separate phases; and multiple mixer modules having inputs connected to an output of the low noise amplifier. The receiver has a configurable resistor network. The receiver is configured such that it can operate in a first mode with said plurality of signals having said first number of phases or a second mode with said plurality of signals having said second number of phases. The configurable resistor network enables the receiver to operate in the first mode in a first configuration, and the second mode in a second configuration. The mixer modules are employed during the operation of the first mode and the second mode.

An integrated circuit that selectively filters out common-mode and differential signals is described. This integrated circuit may include an RF receiver with a mixer that converts signals between a band of frequencies in the RF and a second band of frequencies based at least in part on second signals, where the second band of frequencies is less than the band of frequencies. Moreover, the mixer may include input ports that receive the second signals and include a filter circuit, electrically coupled in parallel with the input ports, that filters out the common-mode signals above a threshold frequency and filters out the differential signals below the threshold frequency. For example, the filter circuit may include a half-wavelength transmission line. Note that the mixer may convert the differential signals to the common-mode signals below the threshold frequency and may convert the common-mode signals to the differential signals above the threshold frequency.

A harmonic mixer that suppresses the degradation of the conversion efficiency is disclosed. That harmonic mixer includes an input transmission line, an output transmission line, and two transistors connected in parallel between the input transmission line and the output transmission line. Two transistors are complementarily driven by a local signal LO and generate an output signal RF with frequencies of 2f.sub.LOf.sub.IF, where f.sub.LO and f.sub.IF are frequencies of a local signal LO and an intermediate signal IF.

A harmonic mixer that suppresses the degradation of the conversion efficiency is disclosed. That harmonic mixer includes an input transmission line, an output transmission line, and two transistors connected in parallel between the input transmission line and the output transmission line. Two transistors are complementarily driven by a local signal LO and generate an output signal RF with frequencies of 2f.sub.LOf.sub.IF, where f.sub.LO and f.sub.IF are frequencies of a local signal LO and an intermediate signal IF.

Some of the embodiments of the present disclosure provide a receiver comprising a class AB common-gate transformer-based low noise transconductance amplifier (LNT) configured to receive an electromagnetic signal, a passive resonant mixer electrically connected to (i) an output port of the class AB common-gate transformer-based LNT and (ii) a local oscillator. The passive resonant mixer can be configured to reject at least one harmonic of the local oscillator. The receiver also comprises a base-band module electrically connected to an output port of the passive resonant mixer.

An apparatus comprising a local oscillator (LO) for driving a mixer, the LO being configured to oscillate at an oscillation frequency, and generate a first set of LO signals, wherein each of the first set of LO signals has a LO signal frequency equal to a first multiplication factor m multiplied by the oscillation frequency, the first multiplication factor m, being an integer greater than or equal to two, and each of the first set of LO signals is separated by adjacent LO signals by a phase difference equal to 360 divided by a first variable n, the first variable n being an integer that is greater than or equal to two.

The present disclosure relates to a subharmonic mixer including first and second radio frequency (RF) inputs, local oscillator inputs configured and arranged to receive at least a first, second, third, and fourth local oscillator signals having respective first, second, third, and fourth phases and each having a first frequency, first, second, third, and fourth outputs, a first capacitor coupled between the first RF input and a first node, a first switch coupled between the first node and the second RF input and including a first control terminal to receive the first local oscillator signal, a second switch coupled between the first node and the first output and including a second control terminal to receive the fourth local oscillator signal, and a third switch coupled between the first node and the third output and including a third control terminal to receive the second local oscillator signal.