Abstract:
A multiple frequency reconfigurable voltage controlled oscillator (VCO) (136) includes a variable capacitance device (112), an inductor (116) coupled in parallel with the variable capacitance device (112), and at least two circuit paths (118, 120, 122) coupled in parallel with the variable capacitance device (112) and the inductor (116). The circuit paths (118, 120, 122) each include a piezoelectric laterally vibrating resonator (126, 130, 134) and a switch (124, 128, 132) for selectably coupling each piezoelectric laterally vibrating resonator (126, 130, 134) in parallel with the inductor (116) and variable capacitance device (112).
Abstract:
A resistance-capacitance oscillation circuit comprises an amplifier and a phase shifting circuit. The phase shifting circuit comprises at least three resistance-capacitance circuit elements, each of which comprises a resistance and a capacitor. At least one of the resistance-capacitance circuit elements comprises a variable resistance and a variable capacitor. The variable resistance is formed of a first electrode, a second electrode, a part of a semiconductor film, a part of a ferroelectric film, and a fourth electrode. The variable capacitor is formed of the second electrode, a third electrode, a fifth electrode, another part of the ferroelectric film, another part of the semiconductor film, and a paraelectric film.
Abstract:
Aspects of a method and system for generation of signals up to extremely high frequency using a delay block are provided. In this regard, a first signal may be delayed, via at least a portion of a plurality of delay elements and via a variable capacitance, to generate a second signal that is 90° out of phase relative to the first signal. Additionally, the first signal and second signal may be mixed to generate a third signal, wherein a frequency of the third signal is twice a frequency of said first signal. The portion of the delay elements utilized for delaying the signal may be controlled via one or more switching elements. In this regard, one of the plurality of delay elements may be selected to output the second signal. Moreover, the portion of the delay elements utilized for delaying the signal may be programmably controlled.
Abstract:
A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO includes a parallel LC circuit having multiple fixed capacitors that can be switched-in or switched-out of the LC circuit according to a capacitor control signal to perform band-select tuning of the VCO. The gain compensator compensates for the variable VCO gain by generating a charge pump reference current that is based on the same capacitor control signal that controls the fixed capacitors in the LC circuit. The gain compensator generates the charge pump reference current by replicating a reference scale current using unit current sources. The number of times the reference scale current is replicated is based on the fixed capacitance that is switched-in to the LC circuit and therefore the frequency band of the PLL. The reference scale current is generated based on a PLL control that specifics certain PLL characteristics such as reference frequency, loop bandwidth, and loop damping. Therefore, the reference pump current can be efficiently optimized for-changing PLL operating conditions, in addition to compensating for variable VCO gain.
Abstract:
Methods and systems for VCO impedance control to optimize performance, efficiency, and power consumption are disclosed and may include selectively coupling one of a plurality of taps on a multi-tap inductive load to a voltage controlled oscillator (VCO) on a chip comprising a plurality of transmitters and receivers. The multi-tap inductive load may comprise a multi-tap transformer or transmission line, which may be integrated on the chip, or may be integrated on a package to which the chip is coupled. A voltage swing at an output of the VCO and/or a current in the VCO may be adjusted by configuring a load of the VCO utilizing the multi-tap inductive load. The multi-tap inductive load may be coupled to the VCO utilizing one or more CMOS switches.
Abstract:
An oscillator includes a first oscillating portion that outputs a first oscillation signal having a first oscillation frequency through a first intermediate node to an output terminal, a mounting portion that includes an insulating layer and that mounts the first oscillating portion, a first line provided in the insulating layer and coupled between the first intermediate node and ground, a second line provided in the insulating layer and coupled between the first intermediate node and a power supply terminal, and a third line provided in the insulating layer and coupled between the first intermediate node and the output terminal.
Abstract:
A system and apparatus for varactor bank switching for a voltage controlled oscillator, is disclosed. Varactor bank switching involves partitioning a varactor bank switch into two anti-parallel branches, wherein each branch comprises a pass-gate circuit that is series-connected to a fixed varactor or capacitor; and maintaining an output common mode voltage of an actual oscillator signal at the varactor-side terminal of each pass-gate circuit, such that a threshold voltage of the switch transistor in the pass-gate circuit is not exceeded and the switch remains in an off-state.
Abstract:
To determine performance degradation at functional module in a normal power state due to a power control device, voltages are applied to oscillators at a power diagnostic module. A first voltage is a supply voltage for the data processing device, and a second voltage is a supply voltage applied at a functional module of the data processing device. Counters are adjusted based on the oscillators to determine the oscillators' respective frequencies. In addition, the power diagnostic module can include a timer to measure the length of time that the functional module is in a low-power state, and an analog to digital converter to measure the voltage applied to the functional module during transitions to and from the low-power state.
Abstract:
A FET transistor voltage-controlled oscillator is provided that includes a crossed-coupled inductor capacitor tank (LC-Tank) transistor voltage-controlled circuit having a first transistor and a second transistor, as well as a transistor frequency multiplying circuit having a third transistor and a fourth transistor. In the design, the gate of the first transistor is connected to the drain of the second transistor, and the gate of the second transistor is connected to the drain of the first transistor. Then, the source of the third transistor is connected to the source of the first transistor, and the source of the fourth transistor is connected to the source of the second transistor. Last, the gate of the third transistor is connected to the gate of the fourth transistor, and the drain of the third transistor is connected to the drain of the fourth transistor. Therefore, the parasitic capacitance present in the first transistor and the parasitic capacitance present in the second transistor generate an effect similar to two capacitors connected in series, via the transistor frequency multiplying circuit. The effect reduces the total capacitance of the voltage-controlled oscillator, to increase the working frequency of the voltage-controlled circuit and allow a circuit having the voltage-controlled circuit to operate at a high frequency.
Abstract:
A direct conversion receiver includes a detector that provides a measure of bias offset that is caused by component mismatches in the direct conversion mixer, and a corrective network that reduces the bias offset based on this measure. The direct conversion mixer demodulates a radio-frequency (RF) input signal via mixing with a local-oscillator (LO) signal to provide a differential baseband output signal. A differential peak detector compares the peak signal value at each side of the mixer's differential output, and a differential integrator averages the difference between these peak signal values to provide the measure of bias offset. The corrective network adds a correction offset to each of the local oscillator local oscillator paths on each of the switching pairs that provide the differential output, but opposite to the local oscillator connections. By applying the correction offset to the opposing transistor in each pair, the difference in switching time between the pairs is reduced, and, correspondingly, the differential-mode leakage from the local oscillator to the RF input stage is reduced.