A new VLSI design for adaptive frequency-detection based on the active oscillator

In this paper, we propose a novel adaptive algorithm to detect the frequency in a noisy environment and its VLSI implementation. The algorithm is computationally efficient since we utilize the special structure of an active oscillator, which results in an adaptive one-coefficient FIR filter realization. A method using the Lagrange multiplier based LMS algorithm is derived for coefficient updating. Based on the proposed algorithm, a high performance VLSI architecture is designed in fixed point operation to reduce the hardware cost. After function simulation, the architecture is implemented by 0.6 /spl mu/m CMOS technology. Its chip area is 2899/spl times/2899 um/sup 2/ and the working frequency is 75 MHz.