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US 4,303,985 AGranted
Analog voltage to pulse rate or analog to frequency converter
AssigneeLitton Systems, Inc.
InventorMax A. Schaffer
Life of this patent
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Abstract
An apparatus for changing an analog input voltage into a pulse rate particularly characterized by (1) the absence of substantial voltage across switching mechanisms, (2) the generation of pulses having precise charge content, and (3) the production of positive and negative pulses having precisely the same charge content.
Claims7
Apparatus for producing pulses having a predetermined charge content comprising:
- a first summing amplifier having a plurality of input terminals and including scaling resistors, an operational amplifier, and feedback resistor, for receiving signals to be algebraically summed;
- apparatus for applying signals from said input terminals to the operational amplifier of said summing amplifier to produce output pulses;
- a first current integrating apparatus having first and second input terminals and including scaling resistors, an operational amplifier and feedback capacitor, said first input terminal being connected to receive the output pulses from said first summing amplifier;
- a source of precision voltage connected to said second input terminal of said integrating apparatus and to a first input terminal of said first summing amplifier;
- the output of said integrating apparatus being connected through a first polarity inverter to a second said input terminal of said first summing amplifier to control the amplitude of the algebraic sum of the charge under positive and negative pulses of the output of said first summing amplifier to be equal to the time integral of said precision voltage.
2 more elements
Dependencies are inferred from the claim text.