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US 10,530,323 B2Granted
Methods and apparatus of adjusting delays of signals
AssigneeHuawei Technologies Co., Ltd.
InventorsFei Chen, Robert Morawski, Tho Le-Ngoc, James Gary Griffiths
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Abstract
In some examples, a delay apparatus includes a controllable delay line comprising a plurality of delay elements selectively connected in a signal path to vary a delay of a signal passing through the delay line, and a controllable phase shifter comprising reflective loads adjustable to vary a phase shift applied to the signal.
Claims19
A delay apparatus comprising:
- a controllable delay line comprising a plurality of delay elements selectively connected in a signal path to vary a delay of a signal passing through the controllable delay line;
- and
- a controllable phase shifter comprising a reflective load adjustable to vary a phase shift applied to the signal, wherein the reflective load comprises:
- a variable capacitance element connected to a reference voltage and tunable to provide different capacitances,
- a shunt resistor connected to the reference voltage in parallel with the variable capacitance element, and
- a tuning capacitor connected in parallel with the shunt resistor and the variable capacitance element, wherein a capacitance of the reflective load is based on a sum of a capacitance of the tuning capacitor and a capacitance of the variable capacitive element.
3 more elements
A delay apparatus comprising:
- a controllable delay line comprising a plurality of delay elements selectively connected in a signal path to vary a delay of a signal passing through the controllable delay line, wherein the controllable delay line comprises:
- multiple sets of delay elements, each set of the multiple sets comprising multiple delay elements, and the multiple sets of delay elements arranged in series, and
- a plurality of switches to selectively select a respective delay element from each set of the multiple sets, the selected respective delay elements from the multiple sets of delay elements connected in series;
- and
- a controllable phase shifter comprising a reflective load adjustable to vary a phase shift applied to the signal.
2 more elements
A method of delaying a signal, comprising:
- controlling a delay line to provide coarse adjustment of a delay of the signal, wherein the delay line comprises:
- multiple sets of delay elements, each set of the multiple sets comprising multiple delay elements, and the multiple sets of delay elements arranged in series, and
- a plurality of switches to selectively select a respective delay element from each set of the multiple sets, the selected respective delay elements from the multiple sets of delay elements connected in series, wherein controlling the delay line comprises controlling the plurality of switches;
- and
- controlling a phase shifter to provide a fine adjustment of a delay of the signal, wherein controlling the phase shifter comprises controlling a capacitance of a variable capacitive element of the phase shifter that further includes a shunt resistor connected in parallel with the variable capacitive element.
2 more elements
Dependencies are inferred from the claim text.