摘要:
A current source (10) includes a control stage (12) responsive to a stable, d.c. input voltage that is operative to produce a control voltage proportional to absolute temperature, PTAT, and an output stage (14) responsive to the PTAT control voltage that is operative to produce an output current that is an essentially constant fraction of an output constant current source. The control stage includes a temperature-dependent control resistor (R) of a given resistor type, and at least one control constant current source providing the control resistor with a temperature dependent control current. The temperature dependent current source includes a temperature dependent current source resistor based on the given resistor type such that the temperature dependencies of the control current and the control resistor tend to cancel in such a manner that a true PTAT control voltage is developed. The output stage includes an output transistor (Q7 and Q8) coupled to an output constant current such that an output current of the output stage has no current contribution other than from the output current source. A method for providing a current that is a constant fraction of an output constant current source includes the steps of: (a) developing a control current that is based on the same resistor type as a control resistor; (b) applying the control current to the control resistor to develop a control voltage that is proportional to absolute temperature; and (c) applying the control voltage to a current divider coupled to an output constant source to provide an output current.
摘要:
Die Erfindung betrifft eine Schaltungsanordnung zur Erzeugung einer zumindest annähernd idealen Diodenkennlinie auf Grundlage einer Diode (7). Erfindungsgemäß ist vorgesehen, daß zu der Diode (7) ein Leistungs-MOSFET (1) mit seiner Steuerstrecke parallel geschaltet ist und die Laststrecke des Leistungs-MOSFET (1) die Anschlußklemmen der idealen Diode bilden, wobei der Gateanschluß des Leistungs-MOSFET (1) mit einem vorgegebenen Spannungspotential beaufschlagt ist, wodurch der Leistungs-MOSFET (1) in Flußrichtung der Diode (7) aufgesteuert und in Sperrichtung abgeschaltet wird.
摘要:
A circuit for providing a regulated output voltage from a charge pump circuit (51) while utilizing very low amounts of power, the circuit including a clock circuit (55) for providing clock pulses to operate the charge pump circuit to produce an output voltage, a bias circuit (54, 56-60) for monitoring the output voltage of the charge pump and furnishing signals for enabling the clock circuit in response to an insufficient output voltage, and circuitry (63-67, 69) for enabling the bias circuit during a fraction of the tool operating time available to the charge pump.
摘要:
A negative charge pump circuit for low voltage and wide voltage range applications. The charge pump includes two single-stage p-type pumps. One of the pumps (11) is used to charge a circuit node (32) down to a threshold voltage |Vt p | less than a desired voltage. When used in such a way, the other pump will charge a substrate to a full -VCC.
摘要:
Es wird eine Schaltungsanordnung zur Begrenzung des Einschaltstroms in einer elektronischen Baugruppe vorgeschlagen, die an eine Versorgungsspannungsquelle anschließbar ist. Ein Verbraucher ist über einen Widerstand anschließbar, der erfindungsgemäß steuerbar ausgebildet ist und nach Anschluß der Baugruppe an die Versorgungsspannungsquelle von einer Ansteuereinheit von einem hochohmigen in einen niederohmigen Zustand gesteuert wird. Die Erfindung wird angewandt in elektronischen Baugruppen, insbesondere Stromversorgungsbaugruppen.
摘要:
A precision voltage reference includes at least one superlattice resonant tunneling diode (10) and support electronics (44). The precision voltage reference is stable as to temperature and radiation.
摘要:
A method includes biasing a first gate voltage to enable unipolar current to flow from a first region of a transistor to a second region of the transistor according to a field-effect transistor (FET)-type operation. The method also includes biasing a body terminal to enable bipolar current to flow from the first region to the second region according to a bipolar junction transistor (BJT)-type operation. The unipolar current flows concurrently with the bipolar current to provide dual mode digital and analog device in complementary metal oxide semiconductor (CMOS) technology.