Frequency mixer

摘要

A mixer for mixing first and second input signals having first and second frequencies respectively. A voltage-to-current converter is coupled with an input for converting a first input signal into a current signal. A multiplier circuit is coupled with the voltage-to-current converter for multiplying the current signal with a second input signal to form an output signal at an output. A matching circuit is provided that couples a component of the current signal back to the input. The matching circuit can comprise a feedback resistor for feeding a part of the current signal back to the input. The second input signal is received at a second input coupled to a second voltage-to-current converter for converting a second input signal into a second current signal. In one embodiment of the mixer the second input is a local oscillator and the current signal is multiplied with a local oscillator signal to form an output signal at the output.