Current boost for differential flash analog to digital converter

Details Current boost for differential flash analog to digital converter Current boost for differential flash analog to digital converter

1996-10-09

1998-04-07

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341118, H03M 136

Patent

active

057369526

ABSTRACT:
A high speed differential analog to digital converter (ADC) is provided. The high speed differential ADC includes a driver section, a comparator section and a decoder section. The driver section includes a pair of series connected resistor ladders. A positive phase and negative phase emitter follower transistor pair is connected to the pair of series connected resistor ladders. The positive phase and negative phase emitter follower transistor has a collector connected to a supply voltage and has an emitter coupled to a respective one of the pair of series connected resistor ladders. A respective positive phase and negative phase AC current source drives the base of the respective positive phase and negative phase emitter follower transistor. A reference DC current source is coupled to the base of the positive phase and negative phase emitter follower transistors for determining a range of the ADC. A current source transistor pair biases the emitter follower transistor pair. A first transistor of the current source transistor pair supplies current to the positive phase emitter follower transistor and a second transistor of the current source transistor pair supplies current to the negative phase emitter follower transistor. The first transistor has a control node capacitively coupled to the emitter of the negative phase emitter follower transistor and the second transistor having a control node capacitively coupled to the emitter of the positive phase emitter follower transistor.

REFERENCES:
patent: 4990917 (1991-02-01), Kohdaka
patent: 5164728 (1992-11-01), Matsuzawa et al.
patent: 5291198 (1994-03-01), Dingwall et al.
patent: 5376834 (1994-12-01), Carobolante
patent: 5384569 (1995-01-01), Komatsu
patent: 5589831 (1996-12-01), Knee
"Differential High-Speed Analog to Digital Converter", Schulte and D.P. Swart, IBM Technical Disclosure Bulletin, vol. 38, No. 01, Jan. 1995, pp. 425-427.

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