Abstract:
A circuit includes a first finger capacitor (100) having a first bus line (110) coupled to a first plurality of finger elements (120) and a second bus line (105) coupled to a second plurality of finger elements (115). The first bus line is parallel to the second bus line. The circuit further includes an inductor (500) having a first leg (125, 515) oriented perpendicular to the first bus line and the second bus line. The first leg of the inductor is coupled to a center (135) of the first bus line. Related methods are also disclosed.
Abstract:
In an example, a phase-locked loop (PLL) circuit (108) includes an error detector (202) operable to generate an error signal; an oscillator (204) operable to provide an output signal having an output frequency based on the error signal and a frequency band select signal, the output frequency being a frequency multiplier times a reference frequency; a frequency divider (208) operable to divide the output frequency of the output signal to generate a feedback signal based on a divider control signal; a sigma-delta modulator (SDM) (209) operable to generate the divider control signal based on inputs indicative of an integer value and a fractional value of the frequency multiplier, the SDM responsive to an order select signal operable to select an order of the SDM; and a state machine (214) operable to, in an acquisition state, generate the frequency band select signal and set the order of the SDM.
Abstract:
An interdigitated capacitor having digits of varying width is disclosed. One embodiment of a capacitor (100) includes a first plurality of conductive digits (110) and a second plurality of conductive digits (110) positioned in an interlocking manner with the first plurality of conductive digits (110), such that an interdigitated structure is formed. The first plurality of conductive digits (110) and the second plurality of conductive digits (110) collectively form a set of digits, where the width of a first digit in the set of digits (110) is non-uniform with respect to a second digit in the set of digits.
Abstract:
Examples herein describe techniques for isolating portions of an IC (100) that include sensitive components (e.g., inductors or capacitors) from return current (330) in a grounding plane (415). An output current generated by a transmitter (105) or driver in an IC can generate a magnetic field (405) which induces return current in the grounding plane. If the return current is proximate the sensitive components (305), the return current can inject noise which can negatively impact other components in the IC. To isolate the sensitive components from the return current, embodiments herein include forming slots (500) through the grounding structure which includes the grounding plane on one or more sides of the sensitive components.
Abstract:
An inductor structure (105, 500, 900) implemented within a semiconductor integrated circuit (IC) can include a coil (205, 505, 905) of conductive material that includes a center terminal (140, 510, 910) located at a midpoint of a length of the coil. The coil can be symmetrical with respect to a centerline (225, 535, 935) bisecting the center terminal. The coil can include a first differential terminal (210, 515, 915) and a second differential terminal (215, 520, 920). The inductor structure can include a return line (155, 560, 960) of conductive material positioned on the center line. The inductor structure can include an isolation ring (220, 525, 945) surrounding the coil. The inductor structure can include a patterned ground shield comprising a plurality of fingers (935, 1035) implemented within an IC process layer located between the coil (905) and a substrate (955) of the IC. The inductor structure can include an isolation wall (1 150) comprising a high conductive material formed to encompass the coil and the patterned ground shield. The isolation wall can be coupled to one end of each finger of the patterned ground shield.
Abstract:
A receiver (100) relates generally to channel adaptation. In this receiver (100), a first signal processing block (101) is coupled to a communications channel (20). The first signal processing block (101) includes: an AGC block (102) and a CTLE block (103) for receiving a modulated signal (21) for providing an analog signal (104); an ADC (105) for converting the analog signal (104) to digital samples (106); and an FFE block (112) for equalizing the digital samples (106) to provide equalized samples (114). A second signal processing block (111) includes: a DFE block (113) for receiving the equalized samples (114) for providing re-equalized samples (116); and a slicer (123) coupled to the DFE block (113) for slicing the re-equalized samples (116). A receiver adaptation block (150) is coupled to the first signal processing block (101) and the second signal processing block (111). The receiver adaptation block (150) is configured for providing an AGC adaptation, a CTLE adaptation, and a slicer adaptation to the communications channel (20).
Abstract:
A circuit for receiving data in an integrated circuit is described. The circuit comprises a receiver (304) configured to receive an input signal and to generate output data based upon the input signal, the receiver having a level detection circuit (310) coupled to receive the input signal; and a calibration circuit (308) coupled to the receiver, the calibration circuit having an input (306) for receiving the input signal; an error detection circuit (31 1 ) coupled to the input, the error detection circuit coupled to receive the input signal, a first reference voltage and a second reference voltage; and a control circuit (340) coupled to an output of the error detection circuit, wherein the control circuit selectively generates either an offset control signal or an amplitude control signal based upon comparisons of the input signal to the first reference voltage and the second reference voltage. A method of receiving data is also disclosed.
Abstract:
In an example, a phase-locked loop (PLL) circuit includes an error detector operable to generate an error signal; an oscillator operable to provide an output signal having an output frequency based on the error signal and a frequency band select signal, the output frequency being a frequency multiplier times a reference frequency; a frequency divider operable to divide the output frequency of the output signal to generate a feedback signal based on a divider control signal; a sigma-delta modulator (SDM) operable to generate the divider control signal based on inputs indicative of an integer value and a fractional value of the frequency multiplier, the SDM responsive to an order select signal operable to select an order of the SDM; and a state machine operable to, in an acquisition state, generate the frequency band select signal and set the order of the SDM.