A 2.5MHz 55dB Switched-Current BandPass Σ∆ Modulator for AM Signal Conversion
نویسندگان
چکیده
We present a Switched-Current (SI) fourth-order bandpass Σ∆ modulator IC prototype. It uses fully-differential circuits in 0.8μm CMOS technology to obtain a Dynamic Range (DR) larger than 55 dB at 2.5MHz center frequency with 30kHz bandwidth in accordance to the requirements of AM digital receivers. The prototype incorporates a single-ended to fullydifferential current-mode buffer for testing purposes. The power consumption of the whole prototype (modulator plus buffer) is 60mW from a 5V supply voltage.
منابع مشابه
Quantization Noise Shaping Degradation in Switched-Current BandPass Sigma-Delta Modulators
This paper presents a systematic analysis of the major switched-current errors and their effects on the degradation of the Noise Shaping for 4th-Order BandPass Σ∆ Modulators. The results obtained have been applied to design a silicon prototype in a 0.8μm CMOS technology. Experimental results show 8-bit resolution for 30kHz signal band centered at 2.5MHz with 10MHz clock frequency.(1)
متن کاملApplications of Polyphase Filters for Bandpass Sigma-delta Analog-to-digital Conversion
The traditional lowpass Sigma-Delta (Σ∆) based Analog-to-Digital (A/D) conversion principle has been recently extended to bandpass for direct IF conversion. Such converter offers high Signal-to-Noise (SNR) ratios for narrowband signals relative to the sampling frequency, at significantly lower oversampling ratios in comparison to the conventional lowpass Σ∆ converters. In this paper a sixth-ord...
متن کاملA Voltage-Mode Switched-Capacitor Bandpass ∆Σ Modulator
A novel fourth-order voltage-mode switched-capacitor bandpass ∆Σ modulator, using direct-charge-transfer pseudo-N-path resonators, is described. This modulator is insensitive to component mismatches and finite opamp bandwidth, and is also less sensitive to finite opamp gain than previous bandpass ∆Σ data converters. It is therefore suitable for high-speed communications applications.
متن کامل10.7MHz Bandpass Delta-Sigma A/D Modulators
There is industrial interest in A/D conversion at the intermediate-frequency (IF) stage of a radio [1], because that allows demodulation and IF filtering to be done digitally. The robustness of the digital circuitry gives manufacturing advantages and allows the use of sophisticated algorithms, which are especially useful with digitally coded transmissions. A/D conversion can be done in quadratu...
متن کاملA Continuous-Time Band-Pass Σ∆ Modulator Implemented in 0.35u BiCMOS using Transmission Lines
This work presents experimental results of a 6 order band-pass continuous-time sigma-delta modulator that uses transmission lines as resonators. It has been implemented in 0.35u SiGe BiCMOS technology. The modulator tolerates two clock cycles of excess loop delay and has similar clock jitter sensitivity than that of an equivalent switched capacitor solution. The ADC operates at a sampling rate ...
متن کامل