Precision function generator

Claim 2

A precision function generator for generating linear or linear stepped ramp waveform signals in response to selected input synchronizing signals, comprising: signal input receiving means for receiving the synchronizing signals; integrator means having an output whose slope is proportional to an input current applied thereto; digital control means responsive to said output for providing a digital control signal, and current source means including phase detector means responsive to said digital control signal and said selectable signal for providing a phase error signal, a plurality of selectively adjusted current means whose outputs are adjustable in response to said phase error signal to provide said input curreNt, means for selecting said selectively adjustable current means, and gate means responsive to a switching pulse for selecting said selectively adjustable current means, said current source means responsive to said digital control signal and the synchronizing signals for providing said input current.

Claim 3

The generator according to claim 1, said signal input receiving means further comprising: a first input; a second input; a counter means responsive to the synchronizing signal applied to said first input for providing a scan control signal; a multivibrator means responsive to the synchronizing signal applied to said first input for providing a switching pulse; and a switch means having a first state and a second state, said first state to receive said scan control signal and said second state to receive the synchronizing signal applied to said second input for providing a selectable signal.

Claim 4

The generator according to claim 1, said digital control means further comprising: discriminator means for detecting when the output of said integrator reaches a pair of predetermined output levels; and digital means responsive to the detected pair of predetermined output levels for providing said digital control signal.

Claim 5

A precision function generator for generating a linear ramp voltage waveform signal in response to a synchronizing signal, comprising: signal input receiving means for receiving the synchronizing signal; integrator means having an output whose slope is proportional to an input current applied thereto; digital control means defining a pair of discriminator means for detecting a pair of predetermined output levels and a logic means defining a flip-flop responsive to the detected output levels for providing a digital control signal; phase detector means responsive to said digital control signal and the synchronizing signal for providing a phase error signal; and current source means responsive to said phase error signal and said digital control signal for providing said input current.

Claim 6

A precision function generator for generating a linear ramp voltage waveform signal in response to a synchronizing signal, comprising: signal input receiving means for receiving the synchronizing signal; integrator means having an output whose slope is proportional to an input current applied thereto; digital control means defining a pair of discriminator means for detecting a pair of predetermined output levels and a logic means defining a flip-flop responsive to the detected output levels for providing a digital control signal; phase detector means responsive to said digital control signal and the synchronizing signal for providing a phase error signal; and current source means responsive to said phase error signal and said digital control signal for providing said input current.

Claim 7

A precision function generator for generating a linear stepped ramp voltage wave form signal in response to an input synchronizing signal, comprising: signal input receiving means for receiving the synchronizing signal; integrator means having an output whose slope is proportional to an input current applied thereto; digital control means defining a pair of discriminator means for detecting a pair of predetermined output levels and a logic means defining a flip-flop responsive to the detected output levels for providing a digital control signal; counter means responsive to the synchronizing signal applied to said signal input receiving means for providing a scan control signal; multivibrator means responsive to the synchronizing signal applied to said signal input receiving means for providing a switching pulse; phase detector means responsive to said digital control signal and said scan control signal for providing a phase error signal; current source means responsive to said phase error signal and said digital control signal for providing said input current; and gate means responsive to said switching pulse for gating said input current during selected portions of the linear stepped ramp voltage waveform signal.

Claim 8

A precision function generator for generating a linear stepped ramp voltage wave form signal in response to an input synchronizing signal, comprising: signal input receiving means for receiving the synchronizing signal; integrator means having an output whose slope is proportional to an input current applied thereto; digital control means defining a pair of discriminator means for detecting a pair of predetermined output levels and a logic means defining a flip-flop responsive to the detected output levels for providing a digital control signal; counter means responsive to the synchronizing signal applied to said signal input receiving means for providing a scan control signal; multivibrator means responsive to the synchronizing signal applied to said signal input receiving means for providing a switching pulse; phase detector means responsive to said digital control signal and said scan control signal for providing a phase error signal; current source means responsive to said phase error signal and said digital control signal for providing said input current; and gate means responsive to said switching pulse for gating said input current during selected portions of the linear stepped ramp voltage waveform signal.