A receiver path circuit comprising: a first-stage-down-sampling-filter 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, 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 input 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; 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, 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. a first-stage-down-sampling-filter 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, a first stage configured to: filter a mixer-output-signal received from a mixer; and provide a first-stage-output-signal; and 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, 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 input 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; 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, a first-stage-intermediate node; a first-stage input 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; 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; 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, 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.