Low Power and High Precision Analog VLSI Design of 1-D DCT for Real-time Application

The need for low power in many wireless and biomedical signal processing applications leaves a great scope for the analog discrete time VLSI architectures over their digital counterparts. To investigate the performance of a discrete cosine transform (DCT) for low energy compression application a subthreshold regime was selected using modified class AB current mirror only circuit. A radix-2 algorithm was selected in order to increase the efficiency of computation instead of complex matrix multiplication. The accuracy of the proposed circuit for an 8-point 1-D DCT computation was observed around ±1% with a power consumption of 1.8mW using a
$0.5\ \mu {m}$
CMOS process.