Low latency data transfer in a system for wireless power transmission
AssigneeTexas Instruments Incorporated
InventorsVinod Mukundagiri, Sudipto Chakraborty
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Abstract
A method, receiver and system for isolated wireless data transfer are disclosed. The receiver includes a switching mixer connected to receive a data signal and a local oscillator signal and to output a mixed differential signal, a programmable gain amplifier using an operational transconductance amplifier (OTA) and resistive feedback, the OTA connected to receive the mixed differential signal and to provide an amplified differential signal to a polyphase filter, and an analog demodulator to demodulate the output of the polyphase filter and provide digital output.
Claims21
A receiver for data communication in a wireless power transfer system comprising:
- a mixer having a first input, a second input, and an output, the first input being adapted to receive a first signal at a first frequency and a first amplitude and a second signal at a second frequency and a second amplitude, the first frequency being lower than the second frequency and the first amplitude being higher than the second amplitude;
- a local oscillator having an output providing a third signal at a third frequency higher than the second frequency, the local oscillator output being coupled to the second input of the mixer;
- the mixer output providing a mixed differential signal;
- a programmable gain amplifier including an operational transconductance amplifier (OTA) and resistive feedback, the OTA having an input coupled to the mixer output and having an output providing an amplified differential signal;
- a polyphase filter having an input coupled to the output of the programmable gain amplifier and having an output;
- and
- an analog demodulator having an input coupled to the output of the polyphase filter and having an output providing a digital output.
A method of providing isolated wireless data transfer in the presence of wireless power transfer, the method comprising:
- receiving an input signal that includes a power signal at a first frequency and a first amplitude and a data signal at a second frequency and a second amplitude, the first frequency being lower than the second frequency and the first amplitude being higher than the second amplitude;
- providing a local oscillator signal at a third frequency higher than the second frequency;
- mixing the input signal and the local oscillator signal and outputting a mixed differential signal, the mixed differential signal including the power signal at a fourth frequency higher than the first frequency and the data signal at a fifth frequency lower than the first frequency;
- receiving the mixed differential signal at a programmable gain amplifier that uses an operational transconductance amplifier (OTA) and resistive feedback and providing an amplified differential signal to a polyphase filter;
- and
- receiving an output of the polyphase filter at an analog demodulator.
A system for isolated wireless power and data transfer, the system comprising:
- a power transmitter;
- a power receiver;
- a data transceiver comprising a transmitter and a receiver, the receiver comprising:
- a mixer having an input signal input, a local oscillator signal input, and a mixed differential signal output, the input signal input receiving a power signal at a first frequency and a first amplitude and a data signal at a second frequency and a second amplitude, the first frequency being lower than the second frequency and the first amplitude being higher than the second amplitude, the local oscillator signal input receiving a local oscillator signal at a third frequency higher than the second frequency, and the mixed differential signal output providing the power signal at a fourth frequency higher than the first frequency and the data signal at a fifth frequency lower than the first frequency,
- a programmable gain amplifier including an operational transconductance amplifier (OTA) and resistive feedback, the OTA having an input coupled to receive the mixed differential signal and to provide an amplified differential signal,
- a polyphase filter having an input coupled to the output of the OTA and an output;
- and
- an analog demodulator having an input coupled to the OTA output to demodulate the output of the polyphase filter and provide digital output.
Dependencies are inferred from the claim text.