A 17-tap 3.5 Gbps finite impulse response pulse shaping filter for 60 GHz transmitter with QPSK modulation

A 17-tap 3.5 Gbps finite impulse response (FIR) pulse shaping filter for 60 GHz transmitters with quadrature phase-shift keying (QPSK) modulation is presented. Measurement results show that an attenuation of 19 dB at 2.2 GHz is achieved with cutoff frequency of 1.76 GHz which enable the 60 GHz transmitter to comply with the stringent spectrum mask requirement. No digital-to-analog converters (DACs) are needed in the proposed approach performed in the analog baseband. The dc power of 3.3 V × 300 mA (55 mA without buffers) is competitive compared to conventional DACs not providing filtering functionality. Implemented in a 0.25 μm SiGe HBT technology, the fully integrated circuit consumes an area of 1.6mm
²
.