US 2003/0156669 A1 · Receiver circuit, in particular for a mobile radio

Abstract

A radio receiver with a low intermediate frequency has a first mixer stage that can be fed with a modulated input signal and at whose output a complex intermediate frequency signal can be derived. Connected downstream of the first mixer stage is a limiting amplifier at whose output the intermediate frequency signal is present in a discrete-value and continuous-time fashion. A sampling device, for sampling the intermediate frequency signal, and a digital demodulator unit are connected to the output of this limiter. The demodulated input signal can be derived at the output of this digital demodulator unit. The present radio receiver requires a low chip area in conjunction with low power consumption, but offers a high sensitivity and accuracy based on the digitally implemented demodulation.

Claims11

Dependent claims

A receiver circuit for demodulating a radio-frequency signal, comprising:

a first mixer stage having a first input, a second input, and an output, said first input for obtaining a radio-frequency signal to be demodulated, said second input for obtaining a complex-value carrier signal, said output for providing a complex-valued intermediate frequency signal;
a limiting amplifier connected to said output of said first mixer stage, said limiting amplifier having an output for providing a discrete-value signal derived from the intermediate frequency signal;
a sampling device connected to said output of said limiting amplifier;
a channel filter designed as a polyphase filter configured between said first mixer stage and said limiting amplifier;
and
a digital demodulator unit connected downstream of said sampling device, said demodulator unit having an output for providing a demodulated signal.

3 more elements

Dependencies are inferred from the claim text.

Receiver circuit, in particular for a mobile radio

Life of this patent

Receiver circuit, in particular for a mobile radio

Life of this patent

Abstract

Claims11