Amplifier Stage

Amplifier Stage

 

(in Russian, kaskad usileniia), a radio-engineering device that contains an amplifier, a load circuit, and a coupling circuit to the preceding or following amplifier stage. The amplifier may be either an electronic semiconductor device, such as a transistor or tunnel diode, or an electron vacuum tube (receiving amplifier tube, klystron, or traveling-wave tube). A signal fed to the input of an amplifier stage is reproduced with amplification at the output (in the load circuit). The ratio of the output voltage, current strength, or power to the input voltage is called the voltage, current, or power gain of the stage.

According to the frequency or spectrum width of the signals amplifier stages are classified as DC, audio-frequency, intermedi-ate-frequency, or broad-band types; according to the type ofconnection of the amplifier they are classified as common-base, common-emitter, or common-collector stages for a transistorand as common-grid, common-cathode, and common-platestages for a receiving amplifier tube. Amplifiers usually have several stages, which are connected in series. This is called acascade connection—hence, the Russian name for the individual sections.

V. M. RODIONOV

References in periodicals archive ?
3) Amplifier Stage: In order to improve the strength of the ECG signal for accurate drowsiness detection results, we used the amplifier stage.
The device is supported by the EVAL-HMC1099 evaluation board, also available from Mouser, and is ideal for pulsed or continuous wave (CW) applications, such as a power amplifier stage for wireless infrastructure, radars, test and measurement equipment, extended battery operation for public mobile radios, and general-purpose transmitter amplification.
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Remaining group of transistors [M.sub.1]-[M.sub.14] form the output current amplifier stage, which provides current gain tunability between X and Z terminals by using current sources [I.sub.A] and [I.sub.B] and the output current [i.sub.Z] can be calculated as
Although the input signal enters through the gate of the common-source transistors ([M.sub.CS]), the [M.sub.CC] also acts as the amplifier stage. Accordingly, the mode-locking structure can elevate the gain as compared to a typical common-source amplifier.
The gain and bandwidth of an amplifier stage is limited by intrinsic parameters of the active device employed.
Driver amplifiers are typically used m the transmit path of a radio architecture to increase signal strength prior to the signal being sent to the final high power amplifier stage. To accomplish this effectively the driver needs to offer high linearity for a given output power to enable a low distortion, high-output drive capability.
After amplifier stage is connected 4th order low-pass filter designed using Bessel approximation which function as anti-aliasing filter with cutoff frequency of 20000Hz.
Each amplifier stage has free oscillations at 11.3 and 12.0 GHz, respectively.
This concerns in particular the last amplifier stage of PENELOPE laser system (called "100J-amplifier") to.
Because the output current of LM723 is lower than 150mA and the gain of [Q.sub.2] is small, it is necessary to use an amplifier stage with [Q.sub.1] and [R.sub.12].
Incorporating a high-voltage differential amplifier stage and a high-current driver, the SM8-packaged device ensures that the MOSFET performs the same function as the diode it replaces, sensing the point at which the secondary current reaches zero.