Methods, apparatus, and system for a frequency doubler for a millimeter wave device

An apparatus, comprising:

• a radar unit;
• a signal processing unit operatively coupled to said radar unit adapted to provide an outgoing signal to said radar unit for transmission and an incoming signal to said radar unit;
• wherein said radar unit comprises a signal generation unit comprising a frequency multiplier comprising:
• a first differential circuit capable of receiving a 0° phase input signal having a first frequency at a first input of the first differential circuit and a 180° phase input signal having said first frequency at a second input of the first differential circuit, and providing a first output signal that is twice the first frequency and has a first phase based on said 0° and said 180° input signals;
• a second differential circuit capable of receiving a 90° phase input signal having said first frequency at a first input of the second differential circuit and a 270° phase input signal having said first frequency at a second input of the second differential circuit, and providing an first output signal that is twice the first frequency and has a second phase that is 180° out of phase from the first phase based on said 90° and said 270° phase input signals;
• and
• a differential transformer configured to receive said first output signal at a first node and receive said second output signal at a second node, wherein said differential transformer is configured to provide a differential output signal that has a second frequency that is twice the first frequency.

An integrated circuit chip, comprising:

• a radar circuit;
• a signal processing unit operatively coupled to said radar circuit adapted to provide an outgoing signal to said radar unit for transmission and an incoming signal to said radar unit;
• an antenna unit for transmitting said outgoing signal and receiving said incoming signal;
• and
• a controller unit to control an operation of at least one of said radar unit, said signal processing unit, and said antenna unit;
• wherein said radar circuit comprises a signal generation unit comprising a first frequency multiplier comprising:
• a first differential circuit capable of receiving a 0° phase input signal at a first input of the first differential circuit and a 180° phase input signal at a second input of the first differential circuit, and providing a first output signal based on said 0° and said 180° input signals;
• a second differential circuit capable of receiving a 90° phase input signal at a first input of the second differential circuit and a 270° phase input signal at a second input of the second differential circuit, and providing an first output signal based on said 90° and said 270° phase input signals, wherein said input signals has a first frequency;
• and
• a differential transformer configured to receive said first output signal at a first node and receive said second output signal at a second node, wherein said differential transformer is capable of providing a first differential output signal that has a frequency that is twice the first frequency.