34results about "Network modifications to reduce temperature" patented technology

Apparatus and methods for regulating gate delays of synchronous and asynchronous digital circuits. Thermally-sensitive circuits include, generally, temperature sensitive voltage sources outputting a voltage signal indicative of the temperature of the digital circuit, where the voltage signal reflects non-linear temperature sensitivity above a predetermined threshold temperature, and delay mechanisms receiving said temperature sensitive voltage signal(s) as input and being configured to automatically continuously modulate the speed of signal propagation through the circuit in response to said voltage signal, thereby causing circuit elements within the circuits to switch less frequently and consequently causing the circuit elements to generate less heat with increasing circuit temperature.

In a dead time control circuit, a delay circuit is connected to an input terminal and adapted to delay signals therethrough by a delay time corresponding to a dead time. A logic circuit has a first input connected via the delay circuit to the input terminal, a second input connected directly to the input terminal, and an output connected to an output terminal. The dead time having adjustable temperature characteristics.

An integrated circuit comprises a biasing circuit for maintaining the transconductance of a Gm cell constant. The integrated circuit comprises an on-chip constant voltage source and an on-chip constant current source. The on-chip constant current source has a connection for an external resistance, the value of the external resistance determining the current generated by the constant current source. The biasing circuit comprises means for providing a first fraction (β) of the current generated by the on-chip current source to bias the output of the Gm cell, and means for providing a second fraction (α) of the voltage generated by the on-chip voltage source to bias the input of the Gm cell. The transconductance of the Gm cell is controlled to be equal to the ratio of said fraction of the current generated by the on-chip current source to said fraction of the voltage generated by the on-chip voltage source.

This invention discloses an active load generation circuit and a filter. The active load generation circuit includes a transistor, a voltage control circuit, a voltage offset and tracking circuit, and a temperature sensing circuit. The transistor provides an impedance and includes a control terminal and an input terminal. The control terminal receives a control voltage, the input terminal receives an input signal, and the impedance is associated with the control voltage. The voltage control circuit generates an intermediate voltage according to a power supply voltage and a first reference voltage. The voltage offset and tracking circuit generates the control voltage according to the input signal and the intermediate voltage such that the control voltage varies with the input signal. The temperature sensing circuit senses an ambient temperature of the active load generation circuit and adjusts the first reference voltage according to the ambient temperature.

The invention discloses a novel double-port input control circuit with a temperature drift suppressing property and a Schmidt property. The circuit consists of a temperature drift suppressing circuit and a window circuit and can be used in the internal or external part of a transformer isolated or photo-isolated solid relay as a control drive of the preceding stage. With the mutual suppression of a triode, the control circuit realizes the temperature drift resisting function through utilizing a current feedback function and ensures connection of the solid relay and relative stable of the closed threshold voltage; meanwhile, the control circuit realizes overturning of the output voltage through utilizing the reversal function of the triode; and the control circuit realizes the window property, namely the Schmidt property of the connected voltage and turnoff voltage of the solid relay through the negative feedback formed by a resistor. Compared with the traditional temperature suppression circuit, the input function of the Schmidt property is increased, so that the problem that the PN junction voltage input in a control apparatus is changed with the change of the environment temperature is solved, and stable input and reliable application of the solid relay in the total temperature operating scope are ensured.

The invention relates to an antenna system for a radio microphone comprising an antenna path starting at an input port (2) and ending at an output port (6), the antenna path having an amplifier (3) and an RF cable (5). To compensate for various cable attenuations, an attenuator (4) is provided between the amplifier (3) and the RF cable (5) in series with a variable slope compensator (7). In order to avoid the negative impact on large signal behavior of variable slope compensators according to the prior art, FETs or pin diodes or similar "microswitches" are used to switch resistors, but only as pure switches with no effect on the signal, to Achieve excellent large-signal behavior.

A filter and an operating method thereof are provided. The filter includes a logic circuit, a power circuit and a filter circuit. The logic circuit provides a switching control signal. The power circuit is coupled to the logic circuit. The filter circuit is coupled to the power circuit and the logic circuit. The filter circuit includes an amplifier, a first capacitor and a first transistor. An output end of the amplifier is coupled to the logic circuit, and provides an output signal. The first capacitor is coupled between an input end and output end of the amplifier. The first transistor is connected in parallel with the first capacitor. A control end of the first transistor is coupled to the power circuit. The logic circuit provides a switching control signal to the power circuit according to the output signal. The power circuit supplies a control voltage to the first transistor according to the switching control signal. Therefore, the filter of the present invention and its method of operation can provide an accurate filtered signal output function.