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A Wilson current mirror is a three-terminal circuit (Fig. 1) that accepts an input current at the input terminal and provides a "mirrored" current source or sink output at the output terminal. The mirrored current is a precise copy of the input current.
A cellular repeater (also known as cell phone signal booster or cell phone signal amplifier) is a type of bi-directional amplifier used to improve cell phone reception. [citation needed] A cellular repeater system commonly consists of a donor antenna that receives and transmits signal from nearby cell towers, coaxial cables, a signal amplifier, and an indoor rebroadcast antenna.
The main benefits for an end user are the following: "5 bar" coverage when there is no existing signal or poor coverage; Higher mobile data capacity, which is important if the end-user makes use of mobile data on their mobile phone (may not be relevant to a large number of subscribers who instead use WiFi where femtocell is located)
In this setup, the output current I OUT is directly related to I REF, as discussed next. The drain current of a MOSFET I D is a function of both the gate-source voltage and the drain-to-gate voltage of the MOSFET given by I D = f ( V GS , V DG ), a relationship derived from the functionality of the MOSFET device.
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A signal booster is a system which increases, or appears to increase, the power of a radio signal. The term may refer to: Radio repeater; Relay transmitter;
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Figure 2: Small-signal circuit for finding output resistance of the Widlar source shown in Figure 1. A test current I x is applied at the output, and the output resistance is then R O = V x / I x. An important property of a current source is its small signal incremental output impedance, which should ideally be infinite.