Switched capacitor transmitter circuits and methods
OwnerDaniel Keyes Butterfield, Peiyuan Wang +1inventors
InventorsDaniel Keyes Butterfield, Peiyuan Wang, Jeremy Darren Dunworth
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Abstract
The present disclosure includes switched capacitor transmitter circuits and methods. In one embodiment, a digital data signal is thermometer encoded and a negative thermo-encoded signal is bit order reversed to control capacitors in a switched capacitor transmitter circuit. In another embodiment, the present disclosure includes a plurality of switched capacitor transmitter circuits coupled to inputs of an inductive network. The inductive network combines voltages from the switched capacitor transmitter circuits to produce a combined voltage on an output.
Claims19
A transmitter comprising:
- a switched capacitor transmitter circuit comprising a plurality of capacitors, wherein the plurality of capacitors are switchably coupled between a power supply terminal and a reference voltage terminal;
- and
- a thermometer encoder circuit to receive a cartesian modulated signal and produce a positive thermo-encoded signal and a negative thermo-encoded signal,
- wherein bit lines of the positive thermo-encoded signal are coupled to control particular capacitors of the plurality of capacitors, and
- wherein bit lines of the negative thermo-encoded signal are coupled to control particular capacitors of the plurality of capacitors in a reversed bit order relative to the bit lines of the positive encoded signal.
A method comprising:
- thermometer encoding a cartesian modulated signal to produce a positive thermo-encoded signal and a negative thermo-encoded signal;
- and
- switchably coupling a plurality of capacitors between a power supply terminal and a reference voltage terminal based on the positive thermo-encoded signal and the negative thermo-encoded signal,
- wherein bit lines of the positive thermo-encoded signal are coupled to control particular capacitors of the plurality of capacitors, and
- wherein bit lines of the negative thermo-encoded signal are coupled to control particular capacitors of the plurality of capacitors in a reversed bit order relative to the bit lines of the positive encoded signal.
A transmitter comprising:
- a switched capacitor transmitter circuit comprising a plurality of capacitors, wherein the plurality of capacitors are switchably coupled between a power supply terminal and a reference voltage terminal;
- a pseudo-differential encoder to receive a cartesian modulated signal and produce a positive pseudo-differential signal and a negative pseudo-differential signal;
- a first thermometer encoder circuit to receive the positive pseudo-differential signal and produce a positive thermo-encoded signal;
- and
- a second thermometer encoder circuit to receive the negative pseudo-differential signal and produce a negative thermo-encoded signal;
- wherein bit lines of the positive thermo-encoded signal are coupled to control particular capacitors of the plurality of capacitors, and
- wherein bit lines of the negative thermo-encoded signal are coupled to control particular capacitors of the plurality of capacitors,
- wherein bit lines of the negative thermo-encoded signal are coupled to control particular capacitors of the plurality of capacitors in a reversed bit order relative to the bit lines of the positive encoded signal.
Dependencies are inferred from the claim text.