Radio frequency circuit

摘要

A digital-to-analog conversion circuit operates by selectively discharging members of a plurality of capacitors. Charging of the capacitors occurs during a reset period while digital-to-analog conversion occurs as the capacitors are discharged. Those capacitors that are discharged are selected from the plurality of capacitors based on a digital input. The analog output includes the charge discharged from the capacitors. The capacitors are optionally divided into separate capacitor banks.

主权项

1. A method of converting a digital input signal to an analog output signal, the method comprising:
receiving the digital input signal including at least two bits; charging both a first capacitor and a second capacitor at the same time using one or more voltage sources; opening a first recharge switch to electrically disconnect the first capacitor from the one or more voltage sources; opening a second recharge switch to electrically disconnect the second capacitor from the one or more voltage sources; setting a first discharge switch configured to control discharge of the first capacitor; setting a second discharge switch configured to control discharge of the second capacitor, wherein charging of the first and second capacitor or setting of the first and second discharge switches is responsive to the two bits; and providing a charge pulse through the first discharge switch and the second discharge switch, the analog output signal being differential and including charge discharged from the first capacitor and the second capacitor.