Patent ID: 9673845
Date: 2017-06-06
CPC Classifications: H03D,H04B

Claim:
1. A mixing stage, comprising: a first modulation stage comprising: a first input adapted to receive an input signal, the input being coupled to a first common node of the mixing stage, a first local oscillator input adapted to receive a local oscillator signal oscillating with a predetermined local oscillator frequency, and a first modulation signal output adapted to provide a first modulated signal depending on the local oscillator signal and on the input signal; a second modulation stage comprising: a second input adapted to receive a phase inverted representation of the input signal, the second input being coupled to a second common node of the mixing stage, a second local oscillator input adapted to receive the local oscillator signal, and a second modulation signal output adapted to provide a second modulated signal depending on the local oscillator signal and on the a phase inverted representation of the input signal; an information signal input coupled to the first common node and to the second common node; a current generation circuit adapted to provide a supply current, the current generation circuit being coupled to the first common node and to the second common node; and a current control circuit coupled to the first common node and to the second common node, the current control circuit being adapted to superimpose an offset current to the current of at least one node of the first common node and the second common node, the current control circuit comprising: a current mirror circuit adapted to provide the offset current; and a digital to analog converter coupled to the current mirror circuit such that a variation of the output voltage of the digital to analog converter causes a variation of the output current of the current mirror circuit.