Interleaved ADC and folded mixer for WLAN devices

摘要

An interleaved ADC can advantageously provide synchronous sampling and time-multiplexed output. Differential I and Q input signals can first be stored by charging a plurality of capacitors. These stored differential signals can be buffered in a time-multiplexed sequence. For example, buffering can include transferring voltages stored by a first set of capacitors at a first time and then transferring voltages stored by a second set of capacitors at a second time. Advantageously, this time-multiplexing allow the ADC to be significantly smaller than conventional implementations of two-input ADCs. A folded mixer with gain control is also provided. This mixer can include a first stage having a first set of inductors and a plurality of first type transistors and a second stage having a second set of inductors and a plurality of second type transistors. The plurality of second type transistors in the second stage, which are in a folded configuration, can be driven by the first set of inductors in the first stage. The outputs of the mixer are positioned between the plurality of second type transistors and the second set of inductors. This configuration advantageously permits the mixer to use a low operating voltage.