Direct Digital Radio Frequency Modulator

摘要

The present disclosure relates to a direct digital radio frequency modulator that includes a plurality of input terminals arranged to receive a multi-bit digital signal, and a plurality of converter circuits. In one example, the converter circuits are arranged to receive at an input terminal one bit of the multi-bit digital signal and to provide at a converter circuit output terminal an analog signal in accordance to the one bit. In the present example, a converter circuit includes an input transistor arranged to receive the one bit for enabling the converter circuit to produce the analog signal, a current source transistor, an additional transistor in cascode to the current source transistor, and a frequency modulator output terminal connected to the output terminal of each converter circuit for providing an analog output signal.

主权项

1. A direct digital radio frequency modulator comprising:
a plurality of input terminals arranged to receive a multi-bit digital signal; and a plurality of converter circuits, wherein each converter circuit is arranged to receive at an input terminal one bit of the multi-bit digital signal and to provide at a converter circuit output terminal an analog signal in accordance to the one bit, wherein each converter circuit includes:
an input transistor arranged to receive the one bit for enabling the converter circuit to produce the analog signal,a current source transistor,an additional transistor in cascode to the current source transistor, anda frequency modulator output terminal connected to the output terminal of each converter circuit for providing an analog output signal.