Continuous-Time Bandpass Delta-Sigma Modulator with 8 GHz Sampling Frequency
نویسندگان
چکیده
This paper presents a concept for a Continuous-Time Bandpass-Delta-Sigma Modulator (CT BPDSM) for class-S amplifiers. Class-S amplifiers are very efficient for signals with high dynamic range and are considered to be one possible replacement for conventional linear amplifiers in RF transmitters. A multi-feedback architecture with return-tozero (RZ) and half-return-to-zero (HRZ) pulses is chosen for the modulator. Noise considerations lead to a low noise transconductor with emitter degeneration. The loop filters consist of LC resonators with Q-enhancement. The effect of excess-loop-delay is mitigated by an optimized clock tree. For a 2.1 GHz input signal an SNR of 59 dB at a bandwidth of 20 MHz is expected.
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