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| Number | Title | Issue Date |
| 4323852 | Fast recovery electrode amplifier A fast recovery audio amplifier for use in electrophysiology and other neurological tests and techniques relating to nerve and muscle functions. The fast recovery amplifier recovers from overload in less than one millisecond, thus enabling its use in clin... | 04/06/1982 |
| 4319197 | ECG Amplifier overload control An AC coupled amplifier system is protected from overloading input signals by means of a "bootstrap" circuit which provides a compensation signal substantially matching the overscale portion of such input signal and applies that compensation signal to the... | 03/09/1982 |
| 4237424 | Gated baseline corrector Input pulses are coupled through a delay network to a pulse amplifier. The amplifier includes feedback circuitry for correcting its output to a particular baseline level, generally zero volts. Within the amplifier feedback path is a gate, which is normall... | 12/02/1980 |
| 4227155 | Amplifier with dark current compensation A pre-amplifier for photomultiplier tubes includes means to compensate for the combined dark current and noise output of a photomultiplier tube without inducing a noise dependent offset voltage at the pre-amplifier output. A feedback amplifier and a compe... | 10/07/1980 |
| 4178558 | DC Level clamping circuit A DC level clamping circuit comprising a differential amplifier circuit constituted by a pair of transistors, a signal source, a first capacitor connected between the signal source and a first input terminal of the amplifier circuit, a second capacitor co... | 12/11/1979 |
| 4147990 | Fast-recovery circuit An improved fast-recovery circuit for ECG amplifiers and the like. The fast-recovery circuit includes threshold responsive circuitry connected in parallel with part of the resistance associated with the integrator in a feedback circuit of the amplifier. T... | 04/03/1979 |
| 4142110 | Circuit to eliminate DC bias A passing circuit for coupling a signal portion and suppressing a DC component included in a composite input signal, includes a transistor having a substantially constant output signal for a variable input signal at a predetermined operating point, and bi... | 02/27/1979 |
| 4114179 | Clamping circuits for television signals A clamping circuit in which a signal such as a line sequential color television signal is clamped to a reference, such as a black level by means of a corrective signal which is the integrated output of a current multiplier. The gain of the multiplier, whi... | 09/12/1978 |
