Radio frequency communication systems with interference cancellation for coexistence

A method of interference cancellation in a mobile device, the method comprising:

• amplifying a radio frequency transmit signal using a power amplifier of a transmitter;
• amplifying a first radio frequency receive signal using a first low noise amplifier of a first receiver;
• filtering the radio frequency transmit signal after amplification by the power amplifier using a bandpass filter selected from a plurality of bandpass filters using a pair of multi-throw switches;
• generating a first analog interference cancellation signal using the bandpass filter, a first controllable gain circuit, and a first controllable phase circuit;
• and
• injecting the first analog interference cancellation signal into the first receiver to compensate the first radio frequency receive signal for interference arising from the transmitter.

An interference compensation system for a mobile device, the interference compensation system comprising:

• a power amplifier configured to amplify a radio frequency transmit signal;
• a first low noise amplifier configured to amplify a first radio frequency receive signal;
• and
• an interference cancellation circuit including a first controllable gain circuit, a first controllable phase circuit, a plurality of bandpass filters, and a pair of multi-throw switches configured to select a bandpass filter from the plurality of bandpass filters to filter the radio frequency transmit signal after amplification by the power amplifier, the bandpass filter configured to operate in combination with the first controllable gain circuit and the first controllable phase circuit to generate a first analog interference cancellation signal that compensates the first radio frequency receive signal for interference.