Abstract:
A circuit includes a comparator, a first circuit, and a second circuit. The comparator includes a first input node, a second input node, and an output node. The first circuit is configured to generate a temperature-dependent reference current at the second input node of the comparator. The second circuit is coupled with the second input node of the comparator. The second circuit is configured to increase a voltage level at the second input node of the comparator in response to the temperature-dependent reference current when a signal at the output node of the comparator indicates a first comparison result, and decrease the voltage level at the second input node of the comparator when the signal at the output node of the comparator indicates a second comparison result.
Abstract:
A method of operating a charge pump of a phase-lock assistant circuit includes determining a first relative timing relationship of a phase of a data signal to a phase of a first phase clock. A second relative timing relationship of the phase of the data signal to a phase of a second phase clock is determined, and the first and second phase clocks have a 45° phase difference. An up signal and a down signal are generated in response to the first relative timing relationship and the second relative timing relationship. The charge pump circuit is driven according to the up signal and the down signal.
Abstract:
An inductor-capacitor phase locked loop (LCPLL) includes an inductor-capacitor voltage controlled oscillator (LCVCO) that provides an output frequency. A calibration circuit includes two comparators and provides a coarse tune signal to the LCVCO. The two comparators respectively compare the loop filter signal with a first reference voltage and a second reference voltage that is higher than the first reference voltage to supply a first and second comparator output, respectively. The calibration circuit is capable of adjusting the coarse tune signal continuously in voltage values and adjusts the coarse tune signal based on the two comparator outputs. A loop filter provides a loop filter signal to the calibration circuit and a fine tune signal to the LCVCO. A coarse tune frequency range is greater than a fine tune frequency range.
Abstract:
An integrated circuit includes a capacitor. A switch is electrically coupled with the capacitor in a parallel fashion. A comparator includes a first input node, a second input node, and an output node. The second input node is electrically coupled with a first plate of the capacitor. The output node is electrically coupled with the switch. A transistor is electrically coupled with a second plate of the capacitor. A circuit is electrically coupled with a gate of the transistor. The circuit is configured to provide a bias voltage to the gate of the transistor so as to control a current that is supplied to charge the capacitor.
Abstract:
An integrated circuit includes at least one first gate electrode of at least one active transistor. At least one first dummy gate electrode is disposed adjacent to a first side edge of the at least one first gate electrode. At least one second dummy gate electrode is disposed adjacent to a second side edge of the at least one first gate electrode. The second side edge is opposite to the first side edge. At least one guard ring is disposed around the at least one first gate electrode, the at least one first dummy gate electrode, and the at least one second dummy gate electrode. An ion implantation layer of the at least one guard ring substantially touches at least one of the at least one first dummy gate electrode and the at least one second dummy gate electrode.
Abstract:
A method of forming an integrated circuit includes forming at least one transistor over a substrate. The at least one transistor includes a first gate dielectric structure disposed over a substrate. A work-function metallic layer is disposed over the first gate dielectric structure. A conductive layer is disposed over the work-function metallic layer. A source/drain (S/D) region is disposed adjacent to each sidewall of the first gate dielectric structure. At least one resistor structure is formed over the substrate. The at least one resistor structure includes a first doped semiconductor layer disposed over the substrate. The at least one resistor structure does not include any work-function metallic layer between the first doped semiconductor layer and the substrate.
Abstract:
A current generator includes an op-amp having a negative terminal arranged to be coupled to an input voltage, a resistance selection circuit having at least one tunable resistor connected with each other, and at least one power transistor. A gate of the at least one power transistor is coupled to an output of the op-amp, and a drain of the at least one power transistor is coupled to the at least one tunable resistor or a load. The resistance selection circuit is configured to select a node of the at least one tunable resistor based on the input voltage for coupling from a positive terminal of the op-amp. The at least one tunable resistor is configured to adjust a resistance setting to control a current level of the current generator based on a power supply voltage or a current of a reference resistor.
Abstract:
A representative level-shifter comprises a dynamically biased current source circuit that receives a first voltage, a first and a second unidirectional current-conducting devices, a first and a second pull-down devices, and a pull-up device. The first and second unidirectional current-conducting devices are coupled to the dynamically biased current source circuit. A voltage output of the level-shifter is located at a first node that is located between the current-constant circuit and the second unidirectional current-conducting device. The first and second pull-down devices are coupled to the first and second unidirectional current-conducting devices, respectively. The pull-up device receives a second voltage and is coupled to the dynamically biased current source circuit and the first unidirectional current-conducting device. The pull-up device is configured to dynamically bias the dynamically biased current source circuit such that a voltage drop of the second unidirectional current-conducting device is output at the voltage output responsive to the pull-up device outputting the second voltage to the dynamically biased current source circuit, the first pull-down device being non-conducting and the second pull-down device being conducting.
Abstract:
An integrated circuit includes a first current source. A second current source is electrically coupled with the first current source via a conductive line. A switch circuit is coupled between the first current source and the second current source. A first circuit is coupled between a first node and a second node. The first node is disposed between the first current source and the switch circuit. The second node is coupled with the first current source. The first circuit is configured for substantially equalizing voltages on the first node and the second node. A second circuit is coupled between a third node and a fourth node. The third node is disposed between the second current source and the switch circuit. The fourth node is disposed coupled with the second current source. The second circuit is configured for substantially equalizing voltages on the third node and the fourth node.
Abstract:
A representative level-shifter comprises a dynamically biased current source circuit that receives a first voltage, a first and a second unidirectional current-conducting devices, a first and a second pull-down devices, and a pull-up device. The first and second unidirectional current-conducting devices are coupled to the dynamically biased current source circuit. A voltage output of the level-shifter is located at a first node that is located between the current-constant circuit and the second unidirectional current-conducting device. The first and second pull-down devices are coupled to the first and second unidirectional current-conducting devices, respectively. The pull-up device receives a second voltage and is coupled to the dynamically biased current source circuit and the first unidirectional current-conducting device. The pull-up device is configured to dynamically bias the dynamically biased current source circuit such that a voltage drop of the second unidirectional current-conducting device is output at the voltage output responsive to the pull-up device outputting the second voltage to the dynamically biased current source circuit, the first pull-down device being non-conducting and the second pull-down device being conducting.