Cancellation circuit using digital to time converter

A cancellation circuit, comprising:

• a limiter connected to an output of a first transmitter power amplifier, wherein the limiter is configured to convert in input sinewave to a digital square wave;
• a digital to time converter (DTC) connected to the limiter, wherein the DTC is configured to receive a DTC control value to delay a signal received by the DTC;
• a RF digital to RF converter connected to the DTC, wherein the RF digital to RF converter is configured to convert the digital square wave input into an analog output, wherein the RF digital to RF converter is configured to receive a RF Digital to RF control value to control a gain of the RF digital to RF converter;
• a cancellation amplifier with an input configured to receive an output from the RF digital to RF converter and an output connected to an output of a second transmitter power amplifier, wherein the cancellation amplifier produces a cancellation signal to cancel an interference signal at the output of the second transmitter power amplifier from the output of the first transmitter power amplifier;
• a receiver including:
• a low noise amplifier (LNA) attached to a first side of a transformer, wherein the transformer has a second side connected to the output of the second power amplifier;
• a baseband mixer connected to the LNA;
• and
• an analog-to-digital converter (ADC) connected to the baseband mixer;
• and
• a digital filter connected to the output of ADC, the digital filter configured to produce a power value detected at the first side of the transformer.

A cancellation circuit for a multiple-input multiple-output system, comprising:

• a first limiter connected to an output of a first transmitter power amplifier, wherein the limiter is configured to convert in input sinewave to a digital square wave;
• a first digital to time converter (DTC) connected to the limiter, wherein the first DTC is configured to receive a first DTC control value to delay a signal received by the first DTC;
• a first RF digital to RF converter connected to the DTC, wherein the first RF digital to RF converter is configured to convert the digital square wave input into an analog output, wherein the first RF digital to RF converter is configured to receive a first RF Digital to RF control value to control a gain of the first RF digital to RF converter;
• a second limiter connected to an output of a second transmitter power amplifier;
• a second digital to time converter (DTC) connected to the limiter, wherein the second DTC is configured to receive a second DTC control value to delay a signal received by the second DTC;
• a second RF digital to RF converter connected to the DTC, wherein the second RF digital to RF converter is configured to convert the digital square wave input into an analog output, wherein the second RF digital to RF converter is configured to receive a second RF Digital to RF control value to control a gain of the second RF digital to RF converter;
• a cancellation amplifier with an input configured to receive an output from the first RF digital to RF converter and the second RF digital to RF converter and an output connected to an output of a third transmitter power amplifier, wherein the cancellation amplifier is configured to produce a cancellation signal to cancel an interference signal at the output of the third transmitter power amplifier from the output of the first transmitter power amplifier and the output of the second transmitter power amplifier;
• and
• a power detector connected to the output of the third power amplifier, the power detector configured to produce a power value detected at the output of the third power amplifier.