Breakdown voltage protection circuit
First Claim
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1. A voltage regulator circuit which comprises:
- current source means connected to a first potential;
reference voltage means connected in series with said current source means for establishing a maximum reference voltage, said current source means and said reference voltage means connected between said first potential and a second potential; and
a source follower connected to said first potential and to the junction between said current source means and said reference voltage means, the output voltage of said source-follower limited to a voltage less than a preselected voltage.
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Abstract
A self-tracking high voltage breakdown protection circuit is provided. A non-destructive reference voltage is established by a gated diode having the same breakdown and walkout characteristics as the integrated circuit devices to be protected. A source-follower configuration couples the reference voltage to the integrated circuit. Devices of the protection circuit are internally connected to make each self-protected.
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Citations
10 Claims
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1. A voltage regulator circuit which comprises:
- current source means connected to a first potential;
reference voltage means connected in series with said current source means for establishing a maximum reference voltage, said current source means and said reference voltage means connected between said first potential and a second potential; and
a source follower connected to said first potential and to the junction between said current source means and said reference voltage means, the output voltage of said source-follower limited to a voltage less than a preselected voltage. - View Dependent Claims (2, 3, 4)
- current source means connected to a first potential;
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5. A voltage regulating circuit for limiting voltage to a value less than a preselected maximum voltage, said circuit connected between first and second supply potentials, which comprises:
- a first field effect transistor having source gate and drain electrodes, said drain electrode coupled to said first potential and said gate and source electrode coupled together;
voltage reference means serially coupled between said source of said first field effect transistor and said second potential;
a second field effect transistor having gate electrode coupled to said source electrode of said first field effect transistor, drain electrode coupled to said first potential, and source electrode limited to said preselected maximum voltage. - View Dependent Claims (6, 7, 8, 9)
- a first field effect transistor having source gate and drain electrodes, said drain electrode coupled to said first potential and said gate and source electrode coupled together;
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10. A self-tracking high voltage breakdown protection circuit comprising:
- a load device coupled to a voltage input;
a gated junction diode voltage reference device coupled to said load device, said load device and said reference device establishing a regulated voltage; and
a source follower for coupling said regulated voltage to a circuit device.
- a load device coupled to a voltage input;
Specification