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A 2 GHz two-point modulator which has a separate high-pass control for DCO modulation is implemented in 0.18 m CMOS. The proposed modulator with the two-path DCO modulation enables a flexible gain partition for the high-pass and low-pass modulation paths within the DCO and relaxes the DCO nonlinearity with 1-b modulation and embedded finite-impulse response (FIR) filtering. A semi-digital...
A 0.65V 2.4GHz/400MHz digital-intensive phase modulator is implemented in 65nm CMOS. In ultra-low voltage design, the two-point modulator suffers a lot from the DCO nonlinearity. In this work, we employ a 2.4GHz semidigital fractional-N PLL with an FIR filter embedded 1-bit high-pass modulation to overcome the nonlinearity problem in the conventional two-point modulator. The 400MHz modulator performs...
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