One of its principal uses is in implementing electronically controlled applications such as variable frequency oscillators and filters and variable gain amplifier stages which are more difficult to implement with standard op-amps.
12.
The company's RF portfolio includes TruPwr ( tm ) RMS power detectors and logarithmic amplifiers; DDS synthesizers; RF prescalers; variable gain amplifiers; ADC drivers, gain blocks, LNAs and other RF amplifiers.
13.
Smith added an extra tube gain stage to the preamp, with three variable gain controls at different points in the circuit ( what is now called a " cascaded " design ), creating the first high-gain amplifier.
14.
"' Amplifiers "'includes precision and operational amplifiers, instrumentation, current sense, differential amplifiers, audio amplifiers, video amplifiers / buffers / filters, variable gain amplifiers, comparators, voltage, other specialty amplifiers and products for special linear functions.
15.
The comparator is a very high gain amplifier with its plus input terminal connected for reference to 0.0 V . Whenever the negative input terminal is taken negative with respect the positive terminal of the amplifier the output saturates positive and conversely negative saturation for positive input.
16.
The signal entering a compressor is split, one copy sent to a variable-gain amplifier and the other to a " side-chain " where the signal level is measured and a circuit controlled by the signal level applies the required gain to an amplifier stage.
17.
The " amplifier " is actually an electrometer, sometimes referred to as a " unity gain amplifier "; its main job is to change the nature of small signals ( in the mV range ) produced by cells so that they can be accurately recorded by low-M? of resistance.
18.
San Diego-based Peregrine Semiconductor has used silicon on sapphire ( SOS ) technology to develop RF integrated circuits ( RFICs ) including RF switches, digital step attenuators ( DSAs ), phase locked-loop ( PLL ) frequency synthesizers, prescalers, mixers / upconverters, and variable-gain amplifiers.
19.
The second was the variable gain amplifier so arranged that until the control voltage reached the value corresponding to a track width of 0.04 " the amplifier gain was held constant at 0dB, But as the control voltage increased further the amplifier gain increased until, at a control voltage corresponding to a zero track width, the amplifier gain was 10dB.
20.
With one containing the picture film with a mono soundtrack for backup purposes, the other ran a sound film that was mixed from the eight tracks recorded at the Academy to four : three of which contained the audio for the left, center, and right stage speakers respectively, while the fourth became a control track with amplitude and frequency tones that drove variable-gain amplifiers to control the volume of the three audio tracks.
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