公开(公告)号：JP2003087058A

公开(公告)日：2003-03-20

申请号：JP2002232764

申请日：2002-08-09

Applicant: ST MICROELECTRONICS INC

Inventor： MARIANI GIORGIO

IPC: H03F1/00 ,  H03H11/24

Abstract: PROBLEM TO BE SOLVED: To provide a voltage-control-type resistor which possesses high resistance-to-voltage linearity for use in a turning circuit, etc. SOLUTION: Many voltage-controlled-type resistance cells are used to form a voltage-controlled-type resistance (value) constituting a body, and each cell is made of a transistor which possesses a capacitor for bias connected between a gate and a source, and a relevant controller which is coupled with that capacitor so as to keep stable charge on that capacitor for bias and keep the gate- source voltage at control voltage, corresponding to the desired resistance (value). The gate voltage applied to each transistor can float together with the source voltage, so as to keep the gate-source voltage constant, and besides that resistance constituting body provides the improve linearity of resistance (value) dependent upon the voltage together with bias action in a larger range while lowering the refresh frequency required for avoiding the penetration of noise.

公开(公告)号：DE69810720T2

公开(公告)日：2003-11-06

申请号：DE69810720

申请日：1998-08-20

Applicant: ST MICROELECTRONICS INC

Inventor： PACE ERMANNO ,  MARIANI GIORGIO ,  FASAN ALESSANDRO

IPC: H05B44/00 ,  H05B33/08

Abstract: An electroluminescent lamp is driven by a driving circuit that can supply an approximately sinusoidal signal, a bi-directional sawtooth signal or a single-ended sawtooth signal. Switches selectively transfer energy from a battery to an inductor and then from the inductor to the lamp. In one embodiment, the lamp voltage is compared to a reference waveform, such as a sinusoid. The switches are activated responsive to the error between the lamp voltage and reference waveform to minimize the error. The lamp can thus be driven with a closer approximation of the reference waveform.

公开(公告)号：DE69810720D1

公开(公告)日：2003-02-20

申请号：DE69810720

申请日：1998-08-20

Applicant: ST MICROELECTRONICS INC

Inventor： PACE ERMANNO ,  MARIANI GIORGIO ,  FASAN ALESSANDRO

IPC: H05B44/00 ,  H05B33/08

Abstract: An electroluminescent lamp is driven by a driving circuit that can supply an approximately sinusoidal signal, a bi-directional sawtooth signal or a single-ended sawtooth signal. Switches selectively transfer energy from a battery to an inductor and then from the inductor to the lamp. In one embodiment, the lamp voltage is compared to a reference waveform, such as a sinusoid. The switches are activated responsive to the error between the lamp voltage and reference waveform to minimize the error. The lamp can thus be driven with a closer approximation of the reference waveform.

公开(公告)号：DE69833409D1

公开(公告)日：2006-04-20

申请号：DE69833409

申请日：1998-08-20

Applicant: ST MICROELECTRONICS INC

Inventor： PACE ERMANNO ,  MARIANI GIORGIO ,  FASAN ALESSANDRO

IPC: H05B44/00

Abstract: The circuit (42) has a voltage source for providing a supply voltage relative to a reference voltage, and an inductive circuit. A signal source supplies a reference signal at the signal output terminal. A switching circuit has a voltage terminal coupled to the voltage source, a lamp terminal coupled to the one of the lamps two driving terminals and a current supply terminal coupled to the inductive circuit. The switching circuit also has an input terminal and is responsive to a clocking signal at an input terminal to apply the supply voltage to the inductive circuit, and to a second switching signal at the second input terminal to couple the inductive circuit to the lamp terminal. A comparator has input coupled to a driving terminal and a second input coupled to the signal output terminal. The comparator provides the clocking signal in response to the driving terminal voltage being greater than the reference voltage terminal.