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| 供应商 | NTLab |
|---|---|
| 型号 | 2-bit 1-channel 50 MHz flash ADC |
| 类型 | Hard IP |
| 到期日 | Silicon proven |
| 源网址 | View more |
| 特征 | AMS BiCMOS 350 nm ADC with programmable threshold (8 thresholds) Resolution 2 bit Supply voltage: 3 V Offset compensation Power digital buffer for PAD-work |
| 详情页 | View more |
| 附件名称 | 350AMS_ADC_02_Brief.pdf |
| 附件链接 | View more |
The circuit is 2-bit ADC with programmable threshold. Least significant bit, calling sign bit, turns to 1 or 0 with changing of differential input signal's polarity. Most significant bit, calling magnitude bit, turns to 1 if there is an excess of the threshold by differential input signal.
The block consists of:
Reference voltages and currents source:
- ;3 asynchronous comparators represent the core of ADC
- ;offset compensation system
- ;clocking signal system
- ;logical "1" level convertor from 1.8 V to 3 V
The choice of a threshold is carried by external 3-bit binary code at input lvl in range from 48 mV to 97 mV. Input signal passes through emitter followers to 3 comparators: sign comparator and two magnitude comparators. Outputs of comparators are fed to clocking system.
There are two working modes of clocking system: asynchronous mode and clocking mode. In asynchronous mode the output signals of comparators are fed directly to output powerful CMOS-buffers, which working for PADs. The CMOS-buffers have separate supply voltage 3 V or 1.8 V, so the logical "1" level of output signal could be 3 V or 1.8 V. In clocking mode the output signals are strobed by external ECL-clocking signal, which is converted to CMOS-signal by in-built ECL-to-CMOS buffer.
The offset compensation system works by output signals of powerful digital buffers. These signals are fed from PADs to logical level converter (from 1.8 V to 3 V), which is necessary while working for 1.8 V supply voltage. The offset compensation system itself is an integrating cascade, accumulating the offset error and shifting the common mode level of comparators' input signal to compensate the error.
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