Multiple rate baseband receiver
First Claim
1. A baseband receiver for receiving bipolar data having positive and negative data pulses at a plurality of data rates, comprising:
- a plurality of equalizer means 1-N for equalizing input bipolar data at a plurality of data rates 1-N;
means for selectively coupling said input bipolar data at a plurality of input data rates to a selected one of said equalizer means;
multiplexing means for selecting data from the selected equalizer means, and having an output;
automatic control means common to said equalizing means having the output of said multiplexing means coupled thereto, for providing a feedback adjustment for said equalizer means; and
level slicing means responsive to said selected equalizing means for receiving positive and negative data pulses from the received data in response to decision thresholds.
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Accused Products
Abstract
The present invention consists of a multirate data receiver which will recover data at any of N data rates with no predetermined restrictions on the value of N. The data rate at which the receiver operates is selected by a single 1-of-N switch selection. An equalizer section is constructed for each of the N data rates but are all controlled by the same (common) automatic adjustment circuitry, which controls gain and frequency compensation. The output from one of the equalizer sections is selected by an analog multiplexer constructed of field effect transistor (FET) switch circuits. The recovered waveforms from the equalizer sections are processed by common circuitry to recover the transmitted data. Clock recovery may be accomplished, for example, by a digital phase locked loop constructed such that the characteristics of the loop filters and divide-by-M feedback counters are easily modified by logical signals controlled by the 1-of-N switches.
30 Citations
10 Claims
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1. A baseband receiver for receiving bipolar data having positive and negative data pulses at a plurality of data rates, comprising:
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a plurality of equalizer means 1-N for equalizing input bipolar data at a plurality of data rates 1-N; means for selectively coupling said input bipolar data at a plurality of input data rates to a selected one of said equalizer means; multiplexing means for selecting data from the selected equalizer means, and having an output; automatic control means common to said equalizing means having the output of said multiplexing means coupled thereto, for providing a feedback adjustment for said equalizer means; and level slicing means responsive to said selected equalizing means for receiving positive and negative data pulses from the received data in response to decision thresholds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification