Patent application number | Description | Published |
20090134856 | Method of optimum current blanking time implementation in current sense circuit - In a method and system for sensing current in a switching regulator (SWR) operating in a current mode, a power switch is coupled to receive the current from a switching element, the power switch being controlled by a gate signal. An inrush of the current causes an initial transient spike (ITS). A buffer having a buffer input and a buffer output is coupled to receive the gate signal and provide a buffered gate signal. The buffer output is disabled during the ITS. A sense switch (SW) is coupled to receive a portion of the current from the switching element, the SW being turned on by the buffered gate signal after the initial transient spike. A sense resistor (SR) is coupled to receive the portion of the current from the SW. An amplifier converts the portion of the current through the SR to a voltage signal for controlling the SWR. | 05-28-2009 |
20090189669 | METHODS AND APPARATUS TO REDUCE PROPAGATION DELAY OF CIRCUITS - Methods and apparatus to reduce propagation delay of circuits are disclosed. A disclosed apparatus to reduce propagation delay of a circuit comprises a level shifter to selectively turn a first circuit on and off; a first switch to couple the first circuit to a second circuit when the first circuit is on, wherein the second circuit is to selectively receive a first current from the first circuit based on a signal the second circuit receives from the level shifter; and a second switch to couple the first circuit to a reference signal based on the first current, the second switch causing the first circuit to start to turn off. | 07-30-2009 |
20100164528 | Methods and Apparatus to Test Electronic Devices - Methods and apparatus to test electronic devices are disclosed. An example method includes setting a first controlled switch to prevent a current detect signal from tripping an overcurrent protection event controlling an operation of the device; setting a second controlled switch to route a first sensed voltage associated with the device to a voltage adjuster; sending a calibration current corresponding to a target threshold current through the device; detecting the first sensed voltage while the calibration current flows through the device; and setting a reference signal substantially equal to the first sensed voltage, wherein the reference signal is to be used to generate the current detect signal. | 07-01-2010 |
20100327777 | CLAMP TO ENABLE LOW VOLTAGE SWITCHING FOR HIGH VOLTAGE TERMINAL APPLICATIONS - An output stage for an LED driver is provided. In particular, a low voltage clamp, which uses several cascode circuits, is provided to protect low voltage switching transistors in the range of two times higher voltage application under both normal and fault conditions. Additionally, a circuit for regulating the bias voltage applied to each of the cascode circuits is provided to prevent damage during startup, while an internal voltage regulator is settling. | 12-30-2010 |
20100327928 | METHOD AND APPARATUS TO IMPROVE AND CONTROL THE PROPAGATION DELAY IN A CURRENT SLEWING CIRCUIT - A circuit for independently controlling slew and propagation delay of a current DAC is provided. The circuit applies dual slope technique with feed-back control the gate (or control electrode) of a switching transistor to make propagation delay independent control from rise/fall slew rate. This allows one to adjust propagation delay and current slew rate separately to achieve better performance. | 12-30-2010 |
20110278936 | LOW DROPOUT REGULATOR WITH MULTIPLEXED POWER SUPPLIES - Generally, with low drop out (LDO) regulators that use multiplexed power supplies, the transistors within the regulator can use a substantial amount of area. Here, a regulator is provided that uses a multiplexer to commonly control the back-gates of multiple power transistors within the LDO. By doing this, the area overhead that would normally be present with these switches (of the multiplexer) can be dramatically reduced without sacrificing performance. | 11-17-2011 |
20130015867 | TOUCH SENSING METHOD AND APPARATUSAANM Aras; SualpAACI DallasAAST TXAACO USAAGP Aras; Sualp Dallas TX USAANM Nihei; TatsuyukiAACI TokyoAACO JPAAGP Nihei; Tatsuyuki Tokyo JPAANM Rahman; AbidurAACI AllenAAST TXAACO USAAGP Rahman; Abidur Allen TX US - A method for measuring for generating a touch capacitance measurement is provided. Gain and offset control signals are generated, where the gain and offset control signals are adjusted to compensate for base capacitance of a touch sensor. The gain control signal is applied to a touch sensor during a first phase of a clock signal, and the offset control signal is applied to an output circuit during a second phase of the clock signal. The output circuit is coupled to the touch sensor during the second phase of the clock signal. The touch capacitance measurement is generated by compensating for the base capacitance with the gain and offset control signals, and a gain is applied to the touch capacitance measurement. | 01-17-2013 |
20130169462 | Apparatus and Method for Dynamically Dampening a Transient Step Response - A circuit has a digital to analog (DA) resistance ladder having an analog output; a capacitor coupled to the analog output; a first resistance coupled from the capacitor to ground; and a switch coupled to the capacitor in parallel to the resistor, wherein the switch, when closed, has a second resistance, and the first resistance is greater than the second resistance. | 07-04-2013 |
20130176155 | APPARATUS AND SYSTEM TO SUPPRESS ANALOG FRONT END NOISE INTRODUCED BY CHARGE-PUMP THROUGH EMPLOYMENT OF CHARGE-PUMP SKIPPING - An apparatus, comprising: a charge-pump; a sampler that samples an optical signal, including: a black sampler; a video sampler; and an analog to digital converter. The first aspect further provides a single clock that is coupled to and provides clocking signals to: a) the charge-pump logic that is coupled to the charge-pump; and b) the sampler logic that is coupled to the sampler that samples the optical signal, wherein if the clock for the charge pump is running faster than an analog front end (“AFE”) video sampling clock, a state-machine control is configured to: skip the charge pump clock period right before a video sample signal falling edge, thereby recovering to a normal operation the next charge-pump clock period, wherein this duty cycle modulation of charge pump clock will not substantially impact charge pump output. | 07-11-2013 |
20140254235 | POWER SUPPLY BROWNOUT PROTECTION CIRCUIT AND METHOD FOR EMBEDDED FRAM - Corruption of data in a FRAM ( | 09-11-2014 |