Abstract:
This paper presents a second-order delta-sigma (/spl Delta//spl Sigma/) modulator fabricated in a 70 GHz (f/sub T/), 90 GHz (f/sub max/) AlInAs-GaInAs heterojunction bipo...Show MoreMetadata
Abstract:
This paper presents a second-order delta-sigma (/spl Delta//spl Sigma/) modulator fabricated in a 70 GHz (f/sub T/), 90 GHz (f/sub max/) AlInAs-GaInAs heterojunction bipolar transistor (HBT) process on InP substrates. The modulator is a continuous time, fully differential circuit operated from /spl plusmn/5 volt supplies and dissipates 1 W. At a sample rate of 3.2 GHz and a signal bandwidth of 50 MHz (OSR=32100 MSPS Nyquist rate) the modulator demonstrates a Spur Free Dynamic Range (SFDR) of 71 dB (12-b dynamic range). The modulator achieves the ideal signal-to-noise ratio (SNR) of 55 dB for a second-order modulator at an oversampling ratio (OSR) of 32. The design of a digital decimation filter for this modulator is complete and the filter is currently in fabrication in the same technology. This work demonstrates the first /spl Delta//spl Sigma/ modulator in III-V technology with ideal performance and provides the foundation for extending the use of /spl Delta//spl Sigma/ modulator analog-to-digital converters (ADC's) to radio frequencies (RF).<>
Published in: IEEE Journal of Solid-State Circuits ( Volume: 30, Issue: 10, October 1995)
DOI: 10.1109/4.466070
Keywords assist with retrieval of results and provide a means to discovering other relevant content. Learn more.
- IEEE Keywords
- Index Terms
- Delta–sigma Modulator ,
- Sampling Rate ,
- Dynamic Range ,
- Ideal Performance ,
- Signal Bandwidth ,
- Bipolar Transistor ,
- Waveform ,
- Band Gap ,
- Fabrication Process ,
- Current Source ,
- Rise Time ,
- Thermal Noise ,
- Sine Wave ,
- Differential Modulation ,
- Output Of Module ,
- Drift Velocity ,
- Current Difference ,
- Fall Time ,
- Clock Frequency ,
- Plus And Minus ,
- SPICE Simulations ,
- Quantization Noise ,
- Integrated Circuit Design ,
- Clock Period ,
- High Breakdown Voltage
Keywords assist with retrieval of results and provide a means to discovering other relevant content. Learn more.
- IEEE Keywords
- Index Terms
- Delta–sigma Modulator ,
- Sampling Rate ,
- Dynamic Range ,
- Ideal Performance ,
- Signal Bandwidth ,
- Bipolar Transistor ,
- Waveform ,
- Band Gap ,
- Fabrication Process ,
- Current Source ,
- Rise Time ,
- Thermal Noise ,
- Sine Wave ,
- Differential Modulation ,
- Output Of Module ,
- Drift Velocity ,
- Current Difference ,
- Fall Time ,
- Clock Frequency ,
- Plus And Minus ,
- SPICE Simulations ,
- Quantization Noise ,
- Integrated Circuit Design ,
- Clock Period ,
- High Breakdown Voltage
