Patent ID: 8482335

Claim:
A high linearity up conversion mixer comprising a voltage-to-current conversion circuit and an up-conversion mixer core circuit, the voltage-to-current conversion circuit comprising a first resistor, a first capacitor, a second resistor, a second capacitor, a fourth resistor, a third capacitor, a fifth resistor, a fourth capacitor and an operational amplifier circuit, the first resistor having one end serving as a differential signal positive input end for receiving an I-channel or a Q-channel positive baseband voltage signal and having the other end connected to the first capacitor, the first capacitor having its other end connected to ground, the second resistor having one end connected to the first resistor and the first capacitor and having the other end connected to the second capacitor and a first input end of the operational amplifier circuit, the second capacitor having its other end connected to a first output end of the operational amplifier circuit for outputting a first low-pass filtered output voltage, the fourth resistor having one end serving as a differential signal negative input end for receiving an I-channel or a Q-channel negative baseband voltage signal and having the other end connected to the third capacitor, the third capacitor having its other end connected to ground, the fifth resistor having one end connected to the fourth resistor and the third capacitor and having the other end connected to the fourth capacitor and a second input end of the operational amplifier circuit, the fourth capacitor having its other end connected to a second output end of the operational amplifier circuit for outputting a second low-pass filtered output voltage, wherein the received positive baseband voltage signal and the received negative baseband voltage signal are low pass filtered by the voltage-to-current conversion circuit and are converted to a first current signal and a second current signal, the first and second current signals being inputted to the up-conversion mixer core circuit to mix with local oscillator signals so as to output high linearity frequency-mixed signals.