Electronic arrangement for receiving a modulated carrier signal
AssigneeU.S. Philips Corporation
InventorJohannes O. Voorman
Life of this patent
Estimating the term…
Abstract
Electronic receive arrangement for receiving a modulated carrier signal, which arrangement comprises a mixer/demodulator driven with the carrier frequency fc, at least one adder included in a closed signal loop, a low-pass filter, and a pulse shaper constituted by a sigma-delta (one-bit) signal converter and driven with the sampling frequency fs and also comprises a digital decimation filter. The signal loop includes the mixer/demodulator so that the modulated carrier signal is applied to the adder and the output signal of the adder is applied to the mixer/demodulator. The signal loop also comprises a second mixer driven with frequency fc, and the frequencies fs and fc present a common multiple.
Claims16
An electronic receive arrangement for receiving a modulated carrier signal, comprising
- a) a closed signal loop acting as a sigma-delta (one-bit) signal converter, the loop including a series arrangement of:
- i) an adder,
- ii) a first mixer/demodulator, coupled to receive a signal from the adder and driven by a carrier frequency fc, and coupled to apply a modulated carrier signal to the adder,
- iii) a low-pass filter,
- iv) a pulse shaper driven with a sampling frequency fs, wherein fc and fs are such that there exist integers m and n for which m.multidot.fs=n.multidot.fc, and
- v) a second mixer driven with the frequency fc;
- and
- b) a digital decimation filter.
Electronic receive arrangement as claimed in one of the preceding claims, characterized in that this arrangement comprises a second one-bit signal converter whose input is connected to the output of the first one-bit signal converter and whose output is connected to the input of the digital decimation filter.
An electronic receive arrangement comprising
- a) first and second closed signal loops, each acting as a sigma-delta (one-bit) signal converter and including a series arrangement of:
- i) an adder,
- ii) a first mixer/demodulator, coupled to receive a signal from the adder and driven by a carrier frequency fc, for applying a modulated carrier signal to the adder,
- iii) a second mixer, driven with the frequency fc,
- iv) a low-pass filter, and
- v) a pulse shaper driven with a sampling frequency fs, wherein fc and fs are such that there exist integers m and n for which m.multidot.fs=n.multidot.fc;
- b) means for polyphase coupling the low-pass filters in the first and loops;
- and
- c) first and second respective digital decimation filters, each coupled to a respective one of the outputs of the first and second loops.
Dependencies are inferred from the claim text.