Single local oscillator architecture for dual-band microwave/millimeter-wave transceiver

摘要

Systems for a dual-band transceiver that re-uses a lower frequency transmitter to drive a local oscillator (LO) for high frequency circuits are disclosed herein. The need for a LO lineup requiring high frequency and high power is eliminated. The output of a lower frequency band is modified to be used as a LO drive for the higher frequency band transceiver. Using a carrier recovery loop, the system is operable to simultaneously operate in both bands. The result is a solution that eliminate the design of a high performance LO circuits for a higher band of a mmW dual-band system. This significantly reduces the overall complexity of the system. Furthermore, the inventive architecture reduces the design complexity and overall cost to implement dual-band circuit.

主权项

1. A bi-directional dual-band transceiver, comprising:
a baseband circuit producing a modulated signal and a continuous wave (CW) tone; a first transceiver circuit comprising:
a first mixer coupled to the baseband circuit and driven by a local oscillator to selectively up-convert from and down-convert to the CW tone; anda first amplification module comprising a first amplifier and a second amplifier, wherein a first switch is used to selectively couple the first amplifier to the first mixer and an antenna, and a second switch is used to selectively couple the second amplifier to the first mixer and the antenna; and a second transceiver circuit comprising:
a second mixer coupled to the baseband circuit and operable to selectively down-convert to and up-convert from the modulated signal;a third switch to selectively couple the first amplification module and the second mixer; anda second amplification module comprising a third amplifier and a fourth amplifier, wherein a fourth switch is used to selectively couple the third amplifier to the second mixer and the antenna, and a fifth switch is used to selectively couple the fourth amplifier to the second mixer and the antenna.