Wideband class AB CRT cathode driver

Details Wideband class AB CRT cathode driver Wideband class AB CRT cathode driver

1988-05-26

1991-03-12

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

358184, 307542, H03F 126, H04N 514

Patent

active

049995863

ABSTRACT:
A wideband amplifier is configured to allow sophisticated low voltage signal processing in a low-cost, high frequency integrated circuit driver. The integrated circuit driver provides output currents to drive high voltage discrete power transistors in such a way as to achieve maximum frequency response from the low-cost discrete transistors. The discrete power transistors in turn provide an output voltage suitable for driving, for example, a CRT display. The transconductance amplifiers, video processing circuitry, current multipliers, and summers are formed in an integrated circuit device utilizing readily available processing and circuit design techniques, and a relatively small number of discrete low power components, including pull-up and pull-down transistors which are chosen to have a fairly high frequency of unity current gain (F.sub.t), yet which are readily available at a very low cost. In order to utilize such low cost pull-up and pull-down transistors, these transistors are driven either in cascode or in a unity gain current mirror configuration from separate pull-up and pull-down currents, in order to avoid the deleterious effects the input base capacitance of the transistor has on its frequency response.

REFERENCES:
patent: 3849735 (1974-11-01), Haenen et al.
patent: 3869568 (1975-03-01), Ueda et al.
patent: 3922585 (1975-11-01), Andrews
patent: 4114109 (1978-09-01), Campioni
patent: 4118731 (1978-10-01), Hinn
patent: 4284958 (1981-08-01), Pryor et al.
patent: 4314167 (1982-02-01), Groves et al.
patent: 4429283 (1984-01-01), Wittlinger
patent: 4727336 (1988-02-01), Mark
Gilbert, "A New Wide-Band Amplifier Technique", IEEE JSSC, Dec. 1968, pp. 353-365.
Widlar, "Design Techniques for Monolithic Operational Amplifiers", IEEE JSSC, Aug. 1969, pp. 184-191.

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