Mode selection amplifier circuit usable in a signal acquisition probe
First Claim
1. A mode selection amplifier circuit having multiple output modes comprising multiple differential amplifier circuits coupled to receive at least two of signal inputs A, B and C with each differential amplifier circuit selectively operable for generating a signal output representative of an output mode, the output mode of each differential amplifier circuit selected from one of algebraic combinations of the signal inputs A−
- C, B−
C, A−
B and (A+B)/2−
C.
1 Assignment
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Accused Products
Abstract
A mode selection amplifier circuit has multiple differential amplifier circuits coupled to receive input signals A, B and C. Each differential amplifier circuit is selectively operable for generating a signal output representative of an output mode with the output mode of each differential amplifier circuit selected from one of algebraic combinations of the signal inputs A−C, B−C, A−B and (A+B)/2−C. The mode selection amplifier circuit is usable in a signal acquisition probe for providing various signal output modes to a measurement test instrument.
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Citations
28 Claims
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1. A mode selection amplifier circuit having multiple output modes comprising multiple differential amplifier circuits coupled to receive at least two of signal inputs A, B and C with each differential amplifier circuit selectively operable for generating a signal output representative of an output mode, the output mode of each differential amplifier circuit selected from one of algebraic combinations of the signal inputs A−
- C, B−
C, A−
B and (A+B)/2−
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- C, B−
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18. A mode selection amplifier circuit having multiple signal output modes comprising;
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a mode switch having multiple differential amplifier circuits coupled to receive at least two of signal inputs A, B and C with each differential amplifier circuit generating a signal output representative of an output mode, the output mode of each differential amplifier circuit selected from one of algebraic combinations of the signal inputs A−
C, B−
C, A−
B and (A+B)/2−
C;a switching circuit having an input coupled to at least a first current source and multiple outputs with each output coupled to one of the differential amplifier circuits, the switching circuit receiving controls signal from the controller for selectively coupling the source to each of the differential amplifier circuits for operating each of the multiple differential amplifier circuits independent of the other differential amplifier circuits. first and second level shifters coupled to receive the selected output mode from the mode switch and generating a level shifted signal representative of the selected output mode; and an output amplifier receiving the level shifted signal output and generating an output signal, the output signal representative of the output mode of the selected differential amplifier circuit. - View Dependent Claims (19, 20, 21, 22)
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23. A signal acquisition probe comprising:
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a probe head having probing contacts for receiving at least two of signal inputs A, B, and C with the signal inputs coupled to a mode selection amplifier circuit having multiple differential amplifier circuits with each differential amplifier circuit selectively operable for generating a signal output representative of an output mode, the output mode of each differential amplifier circuit selected from one of algebraic combinations A−
C, B−
C, A−
B and (A+B)/2−
C; anda probe control box coupled to receive signal output via a probe cable having at least a first coaxial signal line, communications line and voltage lines, the probe control box having probe circuitry and a controller with the controller coupled to the probe circuit and the probe head to provide control signals to the probe circuitry and to the probe head via the communications lines for selectively operating each of the differential amplifier circuits of the mode selection amplifier circuit with the probe control box coupling voltage power to the probe head via the probe cable voltage lines. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification