Fast response frequency and wave shape measuring circuit

Claim 2

A frequency sensitive transducer comprising, a pair of input terminals adapted to be energized from a source of alternating potential the Frequency of which is to be sensed, a ramp generator adapted upon actuation to alter its output quantity as a function of time, a potential sensitive network having an input connection connected to said terminals and an output connection connected to said ramp generator, said potential sensitive network including first switch means, said first switch means being effective during a first predetermined portion of the alternating voltage wave of the potential supplied to said input terminals to actuate said generator whereby said output quantity is effective to be altered in accordance with said function solely during said first interval, second switch means connected to said ramp generator, said second switch means being actuable to place the output quantity of said ramp generator in an initial condition during a second predetermined portion of said alternating voltage wave, and delay means effective to provide a predetermined interval between said first and said second intervals.

Claim 3

A frequency sensitive transducer comprising, a pair of input terminals adapted to be energized from a source of alternating potential the frequency of which is to be sensed, a ramp generator adapted upon actuation to alter its output quantity from an initial condition as a function of time, a potential sensitive network having an input connection connected to said terminals and an output connection connected to said ramp generator, said potential sensitive network being effective during a first predetermined portion of the alternating voltage wave of the potential supplied to said input terminals to actuate said generator whereby said output quantity is effective to be altered in accordance with said function, said potential sensitive network being actuable during a second predetermined portion of said voltage wave to place the output quantity of said ramp generator in said initial condition, said second portion being spaced from said first portion, a quantity holding network having an input means and an output means effective to maintain an output quantity at its output means as established by an input quantity applied to its input means, circuit means connecting said input means of said holding network to said ramp generator for energization by its said output quantity, selectively actuatable means connected to said input means of said holding network, said selectively actuable means being effective to make said connection subsequent to said first predetermined wave portion and prior to said second predetermined wave portion.

Claim 4

A frequency sensitive transducer comprising, a pair of input terminals adapted to be energized from a source of alternating potential the frequency of which is to be sensed, a ramp generator adapted upon actuation to alter its output quantity from an initial condition as a function of time, a potential sensitive network having an input connection connected to said terminals and an output connection connected to said ramp generator, said potential sensitive network being effective during a first predetermined portion of the alternating voltage wave of the potential supplied to said input terminals to actuate said generator whereby said output quantity is effective to be altered in accordance with said function, said potential sensitive network being actuable during a second predetermined portion of said voltage wave to place the output quantity of said ramp generator in said initial condition, said second portion being spaced from said first portion, a quantity holding network having an input means and an output means effective to maintain an output quantity at its output means as established by an input quantity applied to its input means, circuit means connecting said input means of said holding network to said ramp generator for energization by its said output quantity, selectively actuatable means connected to said input means of said holding network, said selectively actuable means being effective to make said connection subsequent to said first predetermined wave portion and prior to said second predetermined wave portion.

Claim 5

The combination of claim 2 in which said selectively actuable means is connected to said potential sensitive network whereby said connection of said holding network to said ramp generator is made for a third predetermined portion of said voltage wave applied to said input terminals.

Claim 6

The combination of claim 3 in which said first predetermined portion is the interval between two consecutive zero potential points on said wave and in which said third and said second predetermined portions occur during the interval between the last of said two zero points and the next zero point to follow said last of said two zero points.

Claim 7

The combination of claim 3 in which said first predetermined portion is the interval during which said wave is of one polarity and in which said second and said third portions occur separately during the interval in which said wave is of a polarity opposite to said one polarity.

Claim 8

The combination of claim 5 in which said ramp generator and said quantity holding network are operational amplifiers and in which said selectively actuable means is a switch.

Claim 9

The combination including a pair of transducers as set forth in claim 6 and in which said output means of each of said holding networks are connected together in algebraic addition and in which said one polarity of one of said transducers is of opposite polarity to said one polarity of the other of said transducers.

Claim 10

An article of manufacture comprising a first operational amPlifier having a first input connection and a first output connection and first capacitive means connected between its said input connection and its said output connection, a first source of potential, a first switching means, a first impedance element, a first circuit connecting said source to said input connection and including said switching means and said impedance element, a pair of input terminals adapted to be energized from a source of spaced potential pulses of a first polarity, a second circuit connecting said switching mans to said input terminals, said switching means being operable to render said first circuit conductive during said pulses to alter the charged condition of said capacitive means, a second switching means, a third circuit including said second switching means connected to said capacitive means, and a fourth circuit connecting said second switching means to said input terminals, said second switching means being operable during the intervals between said pulses to establish an initial charged condition of said capacitive means.

Claim 11

An article of manufacture comprising a first operational amPlifier having a first input connection and a first output connection and first capacitive means connected between its said input connection and its said output connection, a first source of potential, a first switching means, a first impedance element, a first circuit connecting said source to said input connection and including said switching means and said impedance element, a pair of input terminals adapted to be energized from a source of spaced potential pulses of a first polarity, a second circuit connecting said switching mans to said input terminals, said switching means being operable to render said first circuit conductive during said pulses to alter the charged condition of said capacitive means, a second switching means, a third circuit including said second switching means connected to said capacitive means, and a fourth circuit connecting said second switching means to said input terminals, said second switching means being operable during the intervals between said pulses to establish an initial charged condition of said capacitive means.

Claim 12

The combination of claim 8 in which there is provided a second impedance element having an intermediate tap, a second source of potential, a fifth circuit connecting said output connections to said second source through said second impedance element, said third circuit means connecting said second switching means between said tap and said input connection.

Claim 13

The combination of claim 9 in which said tap is located at the midpoint of the magnitude of the impedance of said second impedance element and said second source of potential is of a polarity opposite to that of said first source of potential.

Claim 14

The combination of claim 9 including a second operational amplifier having a second input connection and a second output connection and a second capacitive means, said second output connecting a third switching means, third and fourth impedance elements, a sixth circuit connecting said third and said fourth impedance elements in series between said first source of potential and said first output connection, a seventh circuit connecting the common point of said third and fourth impedance elements to said second input connection.

Claim 15

The combination of claim 11 in which the relative magnitudes of the impedance of said third and fourth impedance elements is such that the potential drop between said common point and said first output connections is equal to the potential developed at said first capacitive means when the duration of said spaced pulse is equal to an established time interval.

Claim 16

The combination of claim 8 in which said first switching device comprises a first diode connected in said first circuit between said first impedance element and said first input connection and a switch having a controlled diode, said controlled diode being connected in shunt circuit with said first diode, said shunt circuit including means establishing a voltage therein which is of a polarity to compensate at least in part for the potential drop across said controlled diode.