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On the master slice array МН2ХА031 containing complementary bipolar transistors an operational amplifier OAmp9 has been developed. It allows programming a number of parameters, such as consumption current, maximum output current, bandwidth, and slew rate of output voltage. In this work, the potential of further increasing the maximum slew rate of the OAmp9 output voltage is described. For its circuit, as well as for the modified OAmp9.1 circuit, the application of differentiating correction networks that boost the processes of stray capacitors recharging in the base circuit of input stage output transistors, is considered. Thus due to increase of reverse voltage on insulating p–n junctions of these output transistors their parasitic collector capacitance was decreased. A schematic technique to increase the operational amplifier response time based on two complementary “folded” cascodes, which eliminates the dynamic overload of the intermediate stage and accelerates the transient processes in a large signal mode in a modified OAmp9.2 circuit, is shown. The electrical diagrams and results of comparative modeling of two modified input stages in the OAmp9.1 and OAmp9.2 structure have been presented. OAmp9.1 and OAmp9.2 are characterized by, respectively, a zero-offset voltage of 0.08 and 0.11 mV, a voltage gain of 1.4 · 104 and 1.4 · 103, a voltage gain on bandwidth of 655 and 298 MHz, and an output voltage slew rate of 689 and 868 V/µs.

Key words: high-speed operational amplifier, maximum output voltage slew rate, master slice array, complementary bipolar transistors
Published in: CIRCUIT ENGINEERING AND DESIGN
Bibliography link: Dvornikov O. V., Tchekhovski V. A., Prokopenko N. N., Chumakov V. E. Input stages of programmable high-speed operational amplifiers based on the master slice array MH2XA031. Proc. Univ. Electronics, 2023, vol. 28, no. 5, pp. 629–641. https://doi.org/10.24151/1561-5405-2023-28-5-629-641. – EDN: QCJQXO
Financial source: the work has been supported by the Russian Science Foundation (project no. 22-29-00637).

Oleg V. Dvornikov
“Minsk Scientific Research Instrument-Making Institute” JSC, Belarus, 220113, Minsk, Yakub Kolas st., 73

Vladimir A. Tchekhovski
Belarusian State University, Belarus, 220045, Minsk, Akademik Kurchatov st., 7

Nikolay N. Prokopenko
Don State Technical University, Russia, 344000, Rostov-on-Don, Gagarin sq., 1

Vladislav E. Chumakov
Don State Technical University, Russia, 344000, Rostov-on-Don, Gagarin sq., 1

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UDK: 621.375
Publication type: Scientific article
Source lang: Russian
DOI: 10.24151/1561-5405-2023-28-5-629-641
RISC id: QCJQXO

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