MULTICHANNEL MULTIDIFFERENTIAL OPERATIONAL AMPLIFIER Russian patent published in 2024 - IPC H03F3/45 

FIELD: electronics; measuring equipment.

SUBSTANCE: invention can be used as a device for switching and amplifying signals in multichannel sensor signal collection systems. Multichannel multidifferential operational amplifier additionally comprises parallel to the first symmetrical differential stage on transistors VT1, VT2 N identical symmetrical differential stages, each of which consists of bipolar transistors VT1I, VT2I, where I is the number of stage from 1 to N, in the combined emitter circuit of which a current source is connected on a bipolar transistor VT3I, with a resistor R3I connected to the emitter. Base of transistor VT3I is connected to voltage divider between resistor R7I, opposite output of which is grounded, and temperature-compensating bipolar transistor VT6I, connected according to diode circuit, in the emitter circuit of which there is a resistor R8I. Collectors of transistors VT1I of all N differential stages are connected to each other and connected to collector of transistor VT 1. Collectors of transistors VT2I of all N differential stages are connected to each other and connected to collector of transistor VT2. Opposite outputs of resistors R3I and R8I are combined and connected to identical outputs of all symmetrical differential stages. To each input of all N symmetrical differential stages formed by bases of transistors VT1I and VT2I, as well as to inputs of symmetrical differential stage formed by bases of transistors VT1 and VT2, identical switches of analogue signals DD are connected. Each of them consists of key S1, for connection of input signal to output of commutator, and key S2, for grounding of output of commutator, controlled by means of signal EI.

EFFECT: increase in the number of differential inputs of the operational amplifier with possibility of their switching for connection and disconnection of input signals.

1 cl, 4 dwg