An Analog Costas Loop MMIC in 130 nm SiGe BiCMOS Technology for Receiver Synchronization of QPSK and BPSK Modulated Signals

An integrated QPSK Costas loop for analog receiver synchronization is presented. The circuit synchronizes the local oscillator signal to the received RF signal with respect to frequency and phase. The IC is implemented in 130 nm SiGe:C BiCMOS technology with f
_t
/f
_max
of 250/300 GHz. The designed circuit can synchronize both QPSK and BPSK modulated signals. A synchronous demodulation with bit rates of up to 8 Gbps both in case of QPSK and BPSK has been achieved at different carrier frequencies with EVM
_RMS
values of -16dB and -12 dB, respectively.