A 1–5GHz Direct-Digital RF Modulator with an Embedded Time-Approximation Filter Achieving -43dB EVM at 1024 QAM
- Resource Type
- Conference
- Authors
- Su, Shiyu; Chen, Mike Shuo-Wei
- Source
- 2019 Symposium on VLSI Circuits VLSI Circuits, 2019 Symposium on. :C20-C21 Jun, 2019
- Subject
- Components, Circuits, Devices and Systems
Computing and Processing
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Power, Energy and Industry Applications
Signal Processing and Analysis
Finite impulse response filters
Band-pass filters
Radio frequency
Quadrature amplitude modulation
Frequency measurement
Floors
Power DAC
RF
DSM
tunable filter
PWM
time-domain
- Language
- ISSN
- 2158-5636
This paper presents a 1–5GHz direct-digital RF modulator with an embedded time-approximation filter (TAF) to suppress out-of-band noise floor. The proposed TAF technique approximates a FIR impulse response in time domain via a modulated LO waveform, leading to an equivalent RF bandpass filtering during the frequency up-conversion process. The silicon prototype achieves - 43dB EVM for a 10MHz 1024 QAM signal at 2.4GHz with peak stopband noise rejection of > 50 dB.