China
Africa
Explore chapters and articles related to this topic
Electronic Circuits
Published in Dale R. Patrick, Stephen W. Fardo, Electricity and Electronics Fundamentals, 2020
Dale R. Patrick, Stephen W. Fardo
Common-emitter amplifiers are used primarily as impedance-matching devices, matching a high-impedance device to a low-impedance load. Practical applications include preamplifiers operated from a high-impedance microphone or phonograph pickup. Common-collector amplifiers are also used as driver transistors for the last stage of amplification. In this application power transistors generally require large amounts of input current to deliver maximum power to the load device. Since the emitter output follows the base, this type of amplifier is often called an emitter follower.
Transistor Circuits
Published in Muhammad H. Rashid, Ahmad Hemami, Electricity and Electronics for Renewable Energy Technology, 2017
In a common-collector amplifier, as the name implies, the collector is common between the input and the output; thus, the input signal is introduced between the base and the collector, and the output signal is taken between the emitter and the collector.
A high linearity low-noise amplifier in 0.25 μm BiCMOS Qubic4x for GSM application
Published in International Journal of Modelling and Simulation, 2020
Michel Al Khoury, Bernard Jarry, Bruno Barelaud, Julien Lintignat
As mentioned previously, there are mainly three kinds of SiGe LNA structure selections: common-emitter, common-collector and common-base (cascade). The common-collector and common-base have advantages such as low power dissipation, ease of obtaining input impedance match and saving chip area due to there being no LC matching networks, but they are not suitable for lowering NF because they are based on current amplification, collector noise will be totally injected into the signal path and the NF will rise and cannot adjust satisfactorily. In order to simplify the circuit and to achieve the specifications needed for the LNA, a common-emitter topology is chosen using a degeneration inductor which can achieve perfect noise matching at narrowband. However, this topology is used with resistive feedback to match the input impedance and improve linearity, which will degrade the noise performance [8].
Automated testbed and real-time port analysis for reconfigurable input–output boards
Published in International Journal of Computer Integrated Manufacturing, 2020
RIO board has six regular ports and two motor ports. Each regular port has 6 pins. Pin 1 is used for VCC (Voltage Common Collector) and Pin 6 is used as GND (Ground) in all ports. Pin 2 and Pin 3 are connected to Serial data and Serial clock, respectively. Pin 4 is used to connect to digital devices which allow Digital read and Digital write. Pin 5 is used to connect with the analog devices which allow analog read and analog write. Except port1, in all other ports pin 2 and pin 3 has digital write functionalities.