Abstract: There is provided a high pass switched capacitor filter having low bandpass ripple. The present filter does not have peaking near its center frequency when sampled at switching frequencies used in communication systems. The high pass filter has three switched capacitor integrators providing a 3-pole Chebyshev high pass switched capacitor filter. A fourth switched capacitor integrator is used to provide an output for the filter. A method of implementing the high pass filter from a set of parameter requirements is also provided. The capacitors used in this filter are ratios of each other and the filter readily lends itself to being implemented as a monolithic integrated circuit, particularly as a CMOS circuit.

Abstract: A CMOS static ALU is capable of selecting one operand from a plurality of inputs and can perform various arithmetic and logic operations in addition to shift left and shift right operations. The ALU uses exclusive OR gates having a minimum number of transistors. In addition, more N-channel transistors are used than P-channel transistors which results in overall smaller size and faster operation. In addition, the ALU has a RAM cell for use as a temporary storage means which is capable of driving the ALU data bus.