US 2022/0190866 A1 · ON-OFF KEYING RECEIVERS

Abstract

An on-off keying (OOK) receiver circuit includes a band-pass filter and an envelope detector. The band-pass filter includes a high-pass filter, a low-pass filter, and a switch. The high-pass filter is configured to filter an OOK input signal. The low-pass filter is configured to filter an output signal of the high-pass filter. The switch is coupled to an output of the high-pass filter, and is configured to, with each cycle of the OOK input signal, dissipate energy stored in the band-pass filter. The envelope detector is configured to receive a filtered OOK input signal from the band-pass filter, and to generate an OOK output signal based on the filtered OOK input signal.

Claims20

Dependent claims

1-2. (canceled)

An on-off keying (OOK) receiver circuit, comprising:

a first input terminal;
a second input terminal;
a band-pass filter comprising:
a high-pass filter comprising:
a first input coupled to the first input terminal;
a second input coupled to the second input terminal;
a first output;
and
a second output;
a low-pass filter comprising:
a first input coupled to the first output of the high-pass filter;
and
a second input coupled to the second output of the high-pass filter;
and
a switch comprising:
a first terminal coupled to the first output of the high-pass filter;
and
a second terminal coupled to the second output of the high-pass filter:
and
an envelope detector coupled to the band-pass filter;
wherein:
the switch comprises a control terminal;
and
the envelope detector comprises:
a comparator comprising:
a first input coupled to the first output of the low-pass filter;
a second input coupled to the second output of the low-pass filter;
and
an output coupled to the control terminal of the switch;
wherein:
the switch is a first switch;
and
the band-pass filter comprises:
a second switch comprising:
a first terminal coupled to the first input terminal;
a second terminal coupled to the first input of the high-pass filter;
and
a control terminal;
and
a third switch, comprising:
a first terminal coupled to the second input terminal;
a second terminal coupled to the second input of the high-pass filter;
and
a control terminal.

41 more elements

A power line communication transceiver, comprising:

an on-off keying (OOK) receiver circuit, comprising:
a first input terminal;
a second input terminal;
a band-pass filter comprising:
a high-pass filter comprising:
a first input coupled to the first input terminal;
a second input coupled to the second input terminal;
a first output;
and
a second output;
a low-pass filter comprising:
a first input coupled to the first output of the high-pass filter;
and
a second input coupled to the second output of the high-pass filter;
a first output;
and
a second output;
and
a switch comprising:
a first terminal coupled to the first output of the high-pass filter;
a second terminal coupled to the second output of the high-pass filter;
and
a control terminal;
and
an envelope detector coupled to the band-pass filter, and comprising:
a comparator comprising:
a first input coupled to the first output of the low-pass filter;
a second input coupled to the second output of the low-pass filter;
and
an output coupled to the control terminal of the switch;
wherein:
the switch is a first switch;
the comparator is a first comparator;
the envelope detector comprises:
a ramp generator coupled to the output of the first comparator;
a second comparator coupled to an output of the ramp generator;
and
the band-pass filter comprises:
a second switch, comprising:
a first terminal coupled to the first input terminal;
a second input coupled to the first input of the high-pass filter;
and
a control terminal coupled to an output of the second comparator.

40 more elements

A power line communication transceiver, comprising:

an on-off keying (OOK) receiver circuit, comprising:
a first input terminal;
a second input terminal;
a band-pass filter comprising:
a high-pass filter comprising:
a first input coupled to the first input terminal;
a second input coupled to the second input terminal;
a first output;
and
a second output;
a low-pass filter comprising:
a first input coupled to the first output of the high-pass filter;
and
a second input coupled to the second output of the high-pass filter;
a first output;
and
a second output;
and
a switch comprising:
a first terminal coupled to the first output of the high-pass filter;
a second terminal coupled to the second output of the high-pass filter;
and
a control terminal;
and
an envelope detector coupled to the band-pass filter, and comprising:
a comparator comprising:
a first input coupled to the first output of the low-pass filter;
a second input coupled to the second output of the low-pass filter:
and
an output coupled to the control terminal of the switch;
wherein:
the high-pass filter is a first high-pass filter;
and
the low-pass filter is a first low-pass filter;
and
the band-pass filter comprises:
a second low-pass filter comprising:
a first input coupled to a first output of the first low-pass filter;
a second input coupled to a second output of the first low-pass filter;
a first output;
and
a second output;
and
a second high-pass filter comprising:
a first input coupled to the first output of the second low-pass filter;
a second input coupled to the second output of the second low-pass filter;
a first output;
and
a second output.

46 more elements

Dependencies are inferred from the claim text.

On-off keying receivers

Life of this patent

On-off keying receivers

Life of this patent

Abstract

Claims20