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| Number | Title | Issue Date |
| 7253682 | Antenna amplifier The antenna amplifier for mobile FM radio reception includes a signal amplifier, a controllable adjusting element having a PIN diode for impedance adaptation, and a control amplifier for regulating the adjusting element. The antenna amplifier has a compensation for ... | 08/07/2007 |
| 6812790 | Signal read circuit In a signal read circuit including a plurality of circuit rows each having a charge amplifier connected to a photoelectric conversion element PD and a CDS circuit 2S for performing correlated double sampling for an output from the charge amplifier, a dummy ci... | 11/02/2004 |
| 6262630 | Rapidly-responding diode detector with temperature compensation A diode detector that is stable and linear over a wide range of variations in both temperature and power supply voltage and can be used to regulate a.c. signals produced by devices that are responsive to control signals includes a detector diode and a fir... | 07/17/2001 |
| 4939787 | Temperature controlled resistive-liquid dummy load A dummy load for a radio frequency transmitter uses a resistive liquid within a tube of non-conducting material as the load. The tube has grounded conductors at each end, and a centrally-located terminal that provides a load, with respect to ground, acros... | 07/03/1990 |
| 4891603 | Logarithmic amplifier A logarithmic amplifier which obtains accurate logarithmic output voltage and expands maximum current value and which realizes accurate logarithmic conversion by eliminating logarithmic conversion error voltage resulting from internal resistance of logari... | 01/02/1990 |
| 4646029 | Variable-gain amplifying circuit Herein disclosed is a variable gain amplifying circuit which comprises a heating element, a heat-sensitive resistance coupled thermally to the heating element, an amplifier including the heat-sensitive resistance, and means for controlling the heat of the... | 02/24/1987 |
| 4516865 | Resistance thermometer A resistance thermometer in which a temperature sensing resistor is connected in parallel with a series combination consisting of a signal output resistor and a compensating resistor. By choosing the resistance ratio between two resistors to be equal to t... | 05/14/1985 |
| 4352053 | Temperature compensating voltage generator circuit A temperature compensating voltage generator circuit for compensating temperature characteristics of an electric circuit whose electrical characteristic varies in accordance with the change of the ambient temperature and whose electrical characteristic ca... | 09/28/1982 |
| 4268887 | Protective system for power stage of IC amplifier A power transistor in the final stage of an IC amplifier feeding a reactive load, such as a loudspeaker, has an emitter resistor connected across the input of a heat-sensitive monitoring transistor by way of a diode in bucking relationship with its base/e... | 05/19/1981 |
| 4185251 | Compensated automatic gain control Circuitry for compensating for the effects of changes in ambient temperature on an automatic gain control arrangement in a missile-borne receiver is shown to include an operational amplifier responsive only to the level of the output signal from an automa... | 01/22/1980 |
| 4166981 | Continuous signal amplitude regulator The present invention concerns the transmission of information, and consists in a continuous regulator responsive to the amplitude of a pilot tone included in the signal whose level is to be regulated, including a variable-gain quadripole through which sa... | 09/04/1979 |
| 4157513 | Protective system for power stage of monolithic circuitry A power transistor in the final stage of an IC amplifier feeding a reactive load, such as a loudspeaker, has an emitter resistor connected across the input of a monitoring transistor by way of a diode, the monitoring transistor being part of a protective ... | 06/05/1979 |
| 4149124 | Thermal protection of amplifiers A method and circuit for protecting the output stage of an amplifier from thermal overload. A normally-open, temperature sensitive switch is thermally coupled to the transistors in the output stage and electrically connected across a portion of the feedba... | 04/10/1979 |
| 4146847 | Power limiting circuitry for use with power amplifier Power limiting circuitry for use with a power amplifier, the power amplifier having (a) a power supply voltage source connected thereto and (b) a load impedance, the power limiting circuitry comprising detecting means for detecting the magnitude of the lo... | 03/27/1979 |
| 4056783 | Linear sound amplifier circuit A Class AB linear power amplifier circuit is connected in a balanced bridge configuration for increasing the fidelity and power output from stereophonic sound systems, such as used primarily in automotive vehicles, the circuitry consisting of a series of ... | 11/01/1977 |
| 4054845 | Transient and thermal protection A normally-closed temperature sensitive switch which is heat coupled to the output transistors of an amplifier, is connected in series with a zener diode and the operating coil of a relay. When the voltage applied to the series circuit, which is the same ... | 10/18/1977 |
| 4041396 | Environmentally sensitive transmit power maximizing circuitry and method In a transmitter designed for periods of extended use, means for sensing the ambient temperature in which the transmitter would operate if activated and adjusting the initial output power of the transmitter so as to reduce the initial output power of the ... | 08/09/1977 |
| 3940707 | Electronic devices for the automatic control of gain and roll-off in amplifiers An electronic circuit for automatically controlling gain and roll-off in wide-band amplifiers for use in tele-distribution systems including a feedback network with a negative temperature coefficient pure ohmic resistance feedback. When automatically cont... | 02/24/1976 |
