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 μm CMOS technology. Its chip area is 2899×2899 um² and the working frequency is 75 MHz