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US 12,500,619 B2Granted
Baseband receiver circuit
AssigneeNXP B.V.
InventorsFrederic Darthenay, Khurram Waheed
Life of this patent
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Abstract
A receiver path circuit includes a first stage, a down-sampler and a second stage. The first stage is configured to filter a mixer-output-signal received from a mixer and provide a first-stage-output-signal. The down-sampler is configured to down-sample the first-stage-output-signal to provide a transition-signal having a transition-frequency. The transition-frequency is lower than the frequency of the first-stage-output-signal. The second stage includes a switched-capacitor circuit that is configured to filter and reduce the frequency of the transition-signal in order to provide a second-stage-output-signal to an ADC.
Claims17
A receiver path circuit comprising:
- a first-stage down-sampling filter that is configured to provide the functionality of:
- a first stage configured to:
- filter a mixer-output-signal received from a mixer;
- and
- provide a first-stage-output-signal;
- and
- a down-sampler configured to:
- down-sample the first-stage-output-signal to provide a transition-signal having a transition-frequency, wherein the transition-frequency is a lower than the frequency of the first-stage-output-signal;
- and
- a second stage, which comprises a switched-capacitor circuit that is configured to:
- filter and reduce the frequency of the transition-signal in order to provide a second-stage-output-signal to an ADC,
- wherein the first-stage down-sampling filter comprises:
- a first-stage-input-node for receiving the mixer-output-signal;
- a first-stage-intermediate-node;
- a first-stage-output-node for providing the transition-signal;
- a sampling-capacitor;
- an input-capacitor;
- an output-capacitor;
- an intermediate-capacitor;
- and
- a first-stage-switch having a switch-node;
- wherein:
- the input-capacitor is connected between the first-stage-input-node and ground;
- the sampling-capacitor is connected between the switch-node of the first-stage-switch and ground;
- the intermediate-capacitor is connected between the first-stage-intermediate-node and ground;
- the output-capacitor is connected between the first-stage-output-node and ground;
- and
- the first-stage-switch is operable to connect the switch-node to each of the first-stage-input-node, the first-stage-intermediate-node and the first-stage-output-node in turn, over a sampling period.
25 more elements
A receiver path circuit comprising:
- a first stage configured to:
- filter a mixer-output-signal received from a mixer;
- and
- provide a first-stage-output-signal;
- a down-sampler configured to:
- down-sample the first-stage-output-signal to provide a transition-signal having a transition-frequency, wherein the transition-frequency is a lower than the frequency of the first-stage-output-signal;
- and
- a second stage, which comprises a switched-capacitor circuit that is configured to:
- filter and reduce the frequency of the transition-signal in order to provide a second-stage-output-signal to an ADC,
- wherein the second stage comprises:
- a second-stage-input-node for receiving the transition-signal;
- a second-stage-output-node for providing the second-stage-output-signal;
- one or more banks of capacitors, wherein each bank of capacitors comprises a plurality of branches that are connected in parallel with each other between the second-stage-input-node and the second-stage-output-node;
- wherein:
- each branch comprises:
- a second-stage-intermediate-node;
- a second-stage-capacitor connected between the second-stage-intermediate-node and ground;
- a second-stage-holding-switch connected between the second-stage-input-node and the second-stage-intermediate-node;
- and
- a second-stage-discharge-switch connected between the second-stage-intermediate-node and the second-stage-output-node;
- the second-stage-holding-switches of each of the branches are operable to selectively connect the second-stage-input-node to a respective one of the second-stage-capacitors sequentially in turn as part of a second stage sampling mode of operation;
- the second-stage-discharge-switches of each of the branches are operable to selectively connect the second-stage-capacitors of each of the branches to the second-stage-output-node at the same time as part of a second stage discharging mode of operation;
- and
- the second-stage-holding-switches and the second-stage-discharge-switches are operated to perform the second stage discharging mode of operation and the second stage sampling mode of operation sequentially in turn.
21 more elements
Dependencies are inferred from the claim text.