| 摘要 |
A down-converter mixer may include a Gilbert cell, two transistor differential pairs, which drive output loads, and transistors defining respective tail generators coupled to common source nodes of the differential pairs. The transistors may receive a radio-frequency signal mixable with a local oscillator signal applied symmetrically between the differential pairs to produce in the loads, a signal deriving from down-converting the radio-frequency signal of an amount given by the frequency of the local oscillator signal. An inductor may be coupled to the common source nodes and which resonates with a capacitive load also coupled to the common source nodes, increases the impedance of such common nodes at the local oscillator signal frequency. The inductor may be in an open loop configuration in the absence of feedback from the mixer, and thus may be active both against noise at radio-frequency and distortion at low frequency.
|
