Voltage to frequency converter

Claim 2

A circuit arrangement for receiving an applied, analog type electrical signal V 0 and generating a pulse train output signal whose average frequency F 3 is proportional to the square of the applied analog type electrical signal V 0 , said circuit arrangement comprising: (a) analog to frequency converter means for converting said applied analog signal V 0 to a first digital output signal comprising a string of pulses of a frequency F 1 =K 1 V 0 , where K 1 is a predetermined analog to digital conversion constant; (b) means for dividing said first output signal by a predetermined divisor D so as to develop a second output signal comprising a string of pulses whose frequency is F 2 =F 1 /D; said frequency F 2 being relatively lower than said frequency F 1 ; (c) means responsive to said second output signal for generating a third output signal having a pulse rate whose frequency is equal to said frequency F 2 of said second output signal and a pulse width of a predetermined duration W which is less than the period of the second output signal; (d) means receiving said first and third output signals and responsive to coincidence between said first and third output signals for developing a pulse in response to each such coincidence, thereby generating a train of pulses whose average frequency F 3 equals (W K 1 2 V 0 2 )/D, thus rendering F 3 proportional to V 0 2 .

Claim 3

A circuit arrangement for receiving an applied analog type electrical signal V 0 and generating a pulse train output signal whose average frequency F 3 is proportional to the square of the applied analog electrical signal V 0 , said circuit arrangement comprising: (a) converting means responsive to (1) the applied signal V 0 and (2) a first digital signal, said converting means transforming the signal V 0 by a factor K 2 representative of said digital signal so as to develop a step like changing or jittered analog type signal represented by the expression K 2 V 0 ; (b) analog to frequency converter means for converting said analog type signal K 2 V 0 to a first output signal comprising a string of pulses having a frequency F 1 =K 2 V 0 ; (c) means for dividing said first output signal by a predetermined divisor D so as to develop a second output signal comprising a string of pulses having a frequency F 2 =F 1 /D, said frequency F 2 being relatively lower than said frequency F 1 ; (d) means for counting said string of pulses of said second output signal and generating in response to said counting said first digital signal having a value representative of the frequency of said second output signal and providing a variable input to said converting means; (e) means responsive to said second output signal for generating a third output signal having a pulse rate whose frequency is equal to said frequency F 2 of second output signal and a pulse width of a predetermined duration W which is less than the period of the frequency F 2 ; (f) means receiving said first and third output signals and responsive to coincidence between said first and third output signals for developing a pulse in response to each such coincidence, thereby generating a train of pulses whose average frequency F 3 =(W K 2 V 0 2 )/D, thus rendering F 3 proportional to V 0 2 .

Claim 4

A circuit arrangement for receiving an applied analog type electrical signal V 0 and generating a pulse train output signal whose average frequency F 3 is proportional to the square of the applied analog electrical signal V 0 , said circuit arrangement comprising: (a) converting means responsive to (1) the applied signal V 0 and (2) a first digital signal, said converting means transforming the signal V 0 by a factor K 2 representative of said digital signal so as to develop a step like changing or jittered analog type signal represented by the expression K 2 V 0 ; (b) analog to frequency converter means for converting said analog type signal K 2 V 0 to a first output signal comprising a string of pulses having a frequency F 1 =K 2 V 0 ; (c) means for dividing said first output signal by a predetermined divisor D so as to develop a second output signal comprising a string of pulses having a frequency F 2 =F 1 /D, said frequency F 2 being relatively lower than said frequency F 1 ; (d) means for counting said string of pulses of said second output signal and generating in response to said counting said first digital signal having a value representative of the frequency of said second output signal and providing a variable input to said converting means; (e) means responsive to said second output signal for generating a third output signal having a pulse rate whose frequency is equal to said frequency F 2 of second output signal and a pulse width of a predetermined duration W which is less than the period of the frequency F 2 ; (f) means receiving said first and third output signals and responsive to coincidence between said first and third output signals for developing a pulse in response to each such coincidence, thereby generating a train of pulses whose average frequency F 3 =(W K 2 V 0 2 )/D, thus rendering F 3 proportional to V 0 2 .

Claim 5

The circuit arrangement according to claim 1 or claim 2 wherein said means receiving said first and third output signal comprises an AND circuit.

Claim 6

The circuit arrangement according to claim 1 or claim 2 wherein said means responsive to said second output signal for generating a third output signal comprises a One-Shot.

Claim 7

The circuit arrangement according to claim 2 wherein said means for counting generates said first digital signal further having a predetermined range.