31results about How to "Small gain" patented technology

The present invention provides an amplifier circuit comprising a differential amplifier and a negative feedback loop circuit, in which a positive feedback loop circuit having a gain smaller than a gain of the negative feedback loop circuit is formed inside the negative feedback loop circuit.

A device by an antenna (1) where the coil conductor (2) of the antenna is wound around a ferrite rod / tube (4), and where one conductor (12) of a connecting cable (10) is electrically coupled to one end portion (2a) of the coil conductor (2) of the antenna (1), and the other conductor (14) of the connecting cable (10) is electrically coupled to a connection point (2b), the connection point (2b) being located on the coil conductor (2), between the two end portions (2a) and (2c) of the coil conductor.

A mobile communication system controls switching a transmission diversity system for each channel, and improves the quality of the channel. When the channel type in an uplink is a channel for transmitting voice, open loop transmission diversity is used (steps S1→S3). When the channel type in an uplink is a channel for transmitting a packet, closed loop transmission diversity is used (steps S1→S2). Since the open loop transmission diversity or the closed loop transmission diversity which ever is more appropriate can be used, a transmission diversity system can be appropriately switched for each channel, thereby improving the quality of the channel.

A voltage controlled oscillator comprising first and second differential delay cells. The first differential delay cell has a first control voltage input terminal. The second differential delay cell is coupled to the first differential delay cell in a loop and has a second control voltage input terminal. The second voltage input terminal is disconnected from the first voltage control input terminal. The first voltage control input terminal receives a first voltage signal, and the second voltage control input terminal receives a second voltage signal different from the first voltage signal.

The invention provides a method for switching between day and night modes of a CCD camera. The beneficial effect of the present invention is that the present invention controls the day-night conversion by replacing the photoresistor with a million CCD video detection technology inside the program. The sensor of the camera itself can transmit the gain value to the back end, that is, the program, and use this gain value to judge the external brightness information. When the brightness is high, the gain value is small, and when the brightness is low, the gain value is large. Therefore, when the light is dark, it needs to be increased. Gain to increase brightness. Conversely, when the gain value is large, it means that the light is very dark, thus controlling the day and night conversion mode of the camera. This makes up for the gap that the gain value cannot be adjusted by the photoresistor and avoids some misjudgments of the photoresistor and repeated switching due to brightness changes caused by turning on and off the infrared lamp.

A pre-amplifier for a magnetic resonance imaging radio-frequency coil. The pre-amplifier comprises an input matching circuit (1), an amplification circuit (2), an output matching circuit (3) and a narrow band filter (4) for filtering a magnetic resonance signal amplified through the amplification circuit (2). The present invention has the technical effect that the pre-amplifier for a magnetic resonance imaging radio-frequency coil generates a gain required by magnetic resonance imaging within a very small range near a magnetic resonance signal frequency point, but only generates a very small gain or has no amplification function completely at other frequency points, thereby significantly reducing the possibility of oscillation of the magnetic resonance imaging radio-frequency coil.

An automatic gain control circuit for a receive apparatus for a mobile object which automatically controls the gain of a variable gain amplifier amplifying a received signal from an antenna installed in the mobile object and outputting the amplified signal to the receive apparatus. The circuit comprises an intensity detector that detects an intensity of the received signal; a comparator that compares the detected intensity with first and second threshold voltages; and a controller that outputs a control signal for adjusting the gain to the variable gain amplifier based on the comparing results of the comparator so that the gain of the variable gain amplifier has a hysteresis with respect to the intensity of the received signal.