A system comprising: a focal plane array, i.e. FPA, comprising: a first die comprising: an array of active bolometers adapted to receive infrared, i.e. IR, radiation from a scene; a bias correction circuitry (1212, 1612); one or more transistors (1630, 1632) configured to vary a bias voltage for each respective active bolometer in response to bias correction signals from the bias correction circuitry (1212, 1612); and at least a first portion of a read-out integrated circuit, i.e. ROIC, the first portion of the ROIC comprising an integrator adapted to integrate detected signals from the active bolometers to provide analog signals in response to the IR radiation received by the active bolometers; a second die stacked relative to the first die and comprising: a low-dropout regulator, i.e. LDO, adapted to provide a regulated voltage to the first die through at least one of a plurality of inter-die connections, wherein the bias correction signal is based on the regulated voltage; and at least a second portion of the ROIC, wherein the second portion of the ROIC comprises at least one analog-to-digital converter, i.e. ADC,; the plurality of inter-die connections adapted to pass signals between the first die and the second die, wherein the passed signals are used to generate output values corresponding to the IR radiation received at the active bolometers, wherein the passed signals comprise the analog signals provided by the integrator, wherein the passed signals comprise the regulated voltage, wherein the at least one ADC is adapted to provide at least one of the output values in response to the analog signals. a first die comprising: an array of active bolometers adapted to receive infrared, i.e. IR, radiation from a scene; a bias correction circuitry (1212, 1612); one or more transistors (1630, 1632) configured to vary a bias voltage for each respective active bolometer in response to bias correction signals from the bias correction circuitry (1212, 1612); and at least a first portion of a read-out integrated circuit, i.e. ROIC, the first portion of the ROIC comprising an integrator adapted to integrate detected signals from the active bolometers to provide analog signals in response to the IR radiation received by the active bolometers; an array of active bolometers adapted to receive infrared, i.e. IR, radiation from a scene; a bias correction circuitry (1212, 1612); one or more transistors (1630, 1632) configured to vary a bias voltage for each respective active bolometer in response to bias correction signals from the bias correction circuitry (1212, 1612); and at least a first portion of a read-out integrated circuit, i.e. ROIC, the first portion of the ROIC comprising an integrator adapted to integrate detected signals from the active bolometers to provide analog signals in response to the IR radiation received by the active bolometers; a second die stacked relative to the first die and comprising: a low-dropout regulator, i.e. LDO, adapted to provide a regulated voltage to the first die through at least one of a plurality of inter-die connections, wherein the bias correction signal is based on the regulated voltage; and at least a second portion of the ROIC, wherein the second portion of the ROIC comprises at least one analog-to-digital converter, i.e. ADC,; a low-dropout regulator, i.e. LDO, adapted to provide a regulated voltage to the first die through at least one of a plurality of inter-die connections, wherein the bias correction signal is based on the regulated voltage; and at least a second portion of the ROIC, wherein the second portion of the ROIC comprises at least one analog-to-digital converter, i.e. ADC,; the plurality of inter-die connections adapted to pass signals between the first die and the second die, wherein the passed signals are used to generate output values corresponding to the IR radiation received at the active bolometers, wherein the passed signals comprise the analog signals provided by the integrator, wherein the passed signals comprise the regulated voltage, wherein the at least one ADC is adapted to provide at least one of the output values in response to the analog signals.