Appeal No. 95-4545
Application No. 08/094220
a source follower enhancement-type field effect
transistor having a gate connected as an input
terminal of the circuit, a drain connected to a positive
power supply, and a source connected to the anode of the
level shift diode;
a constant current source having first and second
terminals;
a current adjusting enhancement-type field effect
transistor having a drain connected to the cathode of the
level shift diode as an output terminal of the circuit
and to the first terminal of the constant current
source, a gate connected to the second terminal of the
constant current source, and a source connected to a
negative terminal of a power supply; and
a resistor connected between the source and the gate
of the current adjusting enhancement-type field effect
transistor whereby a gate-to-source voltage of the
current adjusting enhancement-type field effect transistor
is controlled by a current flowing through the resistor
to enhancement-type field effect transistor.
The examiner’s Answer cites the following prior art:
Sharp 4,584,492 Apr. 22, 1986
Shinohara et al. (Shinohara) 4,645,998 Feb. 24,
1987
MacMillan et al. (MacMillan) 4,926,071 May 15,
1990
Nagasawa 5,177,378 Jan. 5, 1993
Seshita et al. (Seshita) 5,225,718 Jul. 6,
1993
OPINION
3
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