摘要:
The invention relates to a buffer circuit for a receiver device comprising a transconductance stage (105) and an output stage coupled in parallel to output stages of other channels of the device. The output of the transconductance stage (105) is connected to a base of a bipolar transistor (110) in the output stage. A switch (112) is connected between the base of the bipolar transistor (110) and the emitter of the bipolar transistor (110). A controller (120) is arranged to switch the buffer circuit from a switch-off mode to a switch-on mode and back. In switch-off mode the switch (112) is switched on, so as to connect the base and the emitter of the bipolar transistor (110).
摘要:
Apparatus for electrically connecting measurement apparatus to a biological subject, the apparatus including a signal delivery circuit including a current buffer having a current buffer input for receiving a signal from a signal source and a current buffer output for supplying a current to an electrode attached to the biological subject, and a voltage buffer having a voltage buffer input coupled to the current buffer output and a voltage buffer output for providing a voltage signal indicative of a voltage at the electrode, to a sensor.
摘要:
An adaptive bias circuit (400) for a power amplifier (470) may include a terminal node (432) coupled to the power amplifier (470). The adaptive bias circuit (400) may also include a low impedance bias circuit (410) coupled to the terminal node (432). The adaptive bias circuit (400) may further include a high drive bias circuit (440) coupled to the low impedance bias circuit (410) through the terminal node (432). A separation device (430) may be arranged between the low impedance bias circuit (410) and the high drive bias circuit (440).
摘要:
A feedback control loop around a gain element controls the output signal of said gain element responsive to an input or reference signal, and is additionally responsive to a non-linear feedback signal. The feedback loop of this invention comprises computation means for exponentiating a signal representing the output of the gain element to generate said non-linear feedback signal. The control loop of invention provides exceptional transient response when used for driving reactive loads.
摘要:
A power-conversion regulator comprising an inductive reactor, an output filter reactor, and a switch for admitting energy to the inductive reactor, additionally comprises computation circuitry responsive to the flux in the inductive reactor, to a reference signal, to an output voltage, and sometimes to an output load current, for computing the quantity of energy that must be supplied to a load and to the output filter reactor to regulate the output voltage or current to a desired relationship with the reference signal during each chopping waveform cycle driving the switch. As the inductive reactor is charged from an input energy source, the computation circuitry predicts whether the energy in the inductive reactor has become adequate for the regulation.
摘要:
A method, a program code and a controllable delay unit (300) for managing amplitude slope of an input signal (310) and phase slope of the input signal (310) are disclosed. The controllable delay unit (300) comprises an input port (301) configured to receive the input signal (310), and a delay chain (303) configured to provide discrete phase slopes of the input signal (310) at a first set (306) of switchable ports and at a second set (307) of switchable ports. Furthermore, the controllable delay unit (300) comprises a combining sub-unit (308) configured to combine a first and a second discretely delayed signal into an output signal (311), wherein the amplitude slope of the output signal (311) is dependable on a difference between phase slope of the first and second delayed signals and the phase slope of the output signal (311) is dependable on combined phase slope of the first and second delayed signals, and a controlling unit (309) configured to control, based on a control signal (312), the first and second set of switchable ports of the delay chain (303).
摘要:
Ce dispositif d'amplification analogique comporte - un premier étage (28) à transistor (36) base commune recevant le courant modulé d'entrée sur son émetteur, et le signal de sortie de ce premier étage correspond au signal du collecteur, - un deuxième étage (30) est formé par un amplificateur suiveur comportant un transistor (38) à montage collecteur ou drain commun, - un troisième étage (32) comporte un transistor (40) à montage émetteur commun, et - un quatrième étage (34) est un étage amplificateur avec des moyens permettant de réaliser, d'une part, une amplification et, d'autre part, une adaptation d'impédance. Application à un anémomètre laser à rétro-injection optique.
摘要:
A tunable RF filter, comprising: an emitter follower stage (2); and a common emitter stage (4); the common emitter stage (4) providing feedback to the emitter follower stage (2). The common emitter stage (4) may comprise a first transistor (Ti) being the only transistor of the common emitter stage (4); and the emitter follower stage (2) may comprise a second transistor (T2) being the only transistor of the emitter follower stage (2). A further tunable RF filter provides improved linearity, comprising: an emitter follower stage (22); a joint common emitter and emitter follower stage (24); and a gain stage (26); a common emitter output of the joint common emitter and emitter follower stage (24) providing feedback to the emitter follower stage (22), and an emitter follower output of the joint common emitter and emitter follower stage (24) providing an input to the gain stage (26).