Abstract: Among other things, one or more systems and techniques for transition time evaluation of a circuit are provided herein. In some embodiments, a comparator is configured to receive a circuit signal from the circuit. The circuit signal is evaluated by the comparator based upon one or more control voltages to create one or more voltage waveforms. In some embodiments, the one or more voltage waveforms have substantially similar slopes. A time converter, such as a time-to-current converter or a time-to-digital converter, is used to evaluate the one or more output waveforms to determine a transition time, such as a rise time or a fall time, of the circuit. In some embodiments, the one or more output waveforms are used to reconstruct a transition waveform representing a waveform of the circuit signal.

Abstract: A circuit for measuring the gain of an operational amplifier is provided. The circuit comprises a first operational amplifier, a first resistive device and a second resistive device. The first operational amplifier has an original gain and includes a first input terminal and a second input terminal. The first resistive device is coupled between the first input terminal and the second input terminal of the first operational amplifier. The second resistive device is coupled to the second input terminal of the first operational amplifier. The first resistive device and the second resistive device are configured to reduce a predetermined amount of gain from the original gain of the first operational amplifier.

Abstract: A circuit for measuring the gain of an operational amplifier is provided. The circuit comprises a first operational amplifier, a first resistive device and a second resistive device. The first operational amplifier has an original gain and includes a first input terminal and a second input terminal. The first resistive device is coupled between the first input terminal and the second input terminal of the first operational amplifier. The second resistive device is coupled to the second input terminal of the first operational amplifier. The first resistive device and the second resistive device are configured to reduce a predetermined amount of gain from the original gain of the first operational amplifier.

Abstract: A method of determining an effective capacitance of a ring oscillator free of short current. The method comprises determining a frequency of an oscillator signal communicated from a ring oscillator to an inverter via a first communication path. The first communication path has connectivity to a first voltage source, a ground path and the inverter. The first communication path is divided into a second communication path and a third communication path. The method further comprises determining a voltage line current. The method additionally comprises determining an effective capacitance of the ring oscillator based on a first voltage of the first voltage source, the voltage line current and the frequency of the oscillator signal communicated to the inverter along the third communication path.

Abstract: Among other things, one or more systems and techniques for transition time evaluation of a circuit are provided herein. In some embodiments, a comparator is configured to receive a circuit signal from the circuit. The circuit signal is evaluated by the comparator based upon one or more control voltages to create one or more voltage waveforms. In some embodiments, the one or more voltage waveforms have substantially similar slopes. A time converter, such as a time-to-current converter or a time-to-digital converter, is used to evaluate the one or more output waveforms to determine a transition time, such as a rise time or a fall time, of the circuit. In some embodiments, the one or more output waveforms are used to reconstruct a transition waveform representing a waveform of the circuit signal.

Abstract: A method of determining an effective capacitance of a ring oscillator free of short current. The method comprises determining a frequency of an oscillator signal communicated from a ring oscillator to an inverter via a first communication path. The first communication path has connectivity to a first voltage source, a ground path and the inverter. The first communication path is divided into a second communication path and a third communication path. The method further comprises determining a voltage line current. The method additionally comprises determining an effective capacitance of the ring oscillator based on a first voltage of the first voltage source, the voltage line current and the frequency of the oscillator signal communicated to the inverter along the third communication path.

Abstract: Among other things, one or more techniques for creating an array model for analog device modeling are provided. In an embodiment, the array model represents a mean value or a standard deviation value of an analog device characteristic for an analog device based on a physical location of the analog device within a circuit layout, where the physical location is identified using a physical set of coordinates. The physical set of coordinates maps to an array set of coordinates of the array model. In this manner, a mean value and a standard deviation value are obtainable from the array model using the array set of coordinates. The mean value and the standard deviation value are usable to model the analog device, and thus a circuit within which the analog device is used, to obtain a more accurate or realistic prediction of operation or behavior, for example.

Abstract: A time to current conversion apparatus and methods. An impedance having an input for selectively receiving a time varying periodic signal or a known voltage signal is provided; and a current output is coupled to the impedance. By observing the average current through the impedance for the known voltage signal over a time period, and by observing the average current through the impedance for a time varying periodic signal, the duty cycle of the time varying periodic signal may be determined by evaluating a ratio of a first average current observed at the current output while the time varying periodic signal is coupled to the impedance to a second average current observed at the current output while the known voltage signal is coupled to the impedance. An embodiment time to current converter circuit is disclosed. Method embodiments for determining the duty cycle of a time varying periodic signal are provided.

Abstract: Some embodiments relate a capacitor array arranged on a semiconductor substrate. The capacitor array includes an array of unit capacitors arranged in a series of rows and columns. An interconnect structure couples unit capacitors of the array to establish a plurality of capacitor elements. The respective capacitor elements have different numbers of unit capacitors and different corresponding capacitances. In establishing the plurality of capacitor elements, the interconnect structure couples unit capacitors of the array in substantially identical sub-arrays tiled over the semiconductor substrate. Other methods and devices are also disclosed.

Abstract: Some embodiments relate a capacitor array arranged on a semiconductor substrate. The capacitor array includes an array of unit capacitors arranged in a series of rows and columns. An interconnect structure couples unit capacitors of the array to establish a plurality of capacitor elements. The respective capacitor elements have different numbers of unit capacitors and different corresponding capacitances. In establishing the plurality of capacitor elements, the interconnect structure couples unit capacitors of the array in substantially identical sub-arrays tiled over the semiconductor substrate. Other methods and devices are also disclosed.

Abstract: A time to current conversion apparatus and methods. An impedance having an input for selectively receiving a time varying periodic signal or a known voltage signal is provided; and a current output is coupled to the impedance. By observing the average current through the impedance for the known voltage signal over a time period, and by observing the average current through the impedance for a time varying periodic signal, the duty cycle of the time varying periodic signal may be determined by evaluating a ratio of a first average current observed at the current output while the time varying periodic signal is coupled to the impedance to a second average current observed at the current output while the known voltage signal is coupled to the impedance. An embodiment time to current converter circuit is disclosed. Method embodiments for determining the duty cycle of a time varying periodic signal are provided.