Mixed signal system-on-a-chip integrated simultaneous multiple sample/hold circuits and embedded analog comparators
An integrated circuit includes a plurality of circuit groups, each circuit group containing a plurality of analog inputs, a buffer, a sample/hold circuit and a comparator. Each buffer has an input to which any of the analog inputs in its group may be programmably connected. The output of each buffer is coupled to the input of the sample/hold circuit in the group. The output of each sample/hold circuit is coupled to one input of a multiplexer. The output of the multiplexer is coupled to the input of an amplifier having programmable gain and programmable offset. The comparator in each group has inputs that may be programmably coupled to at least one analog input in the group or to a reference voltage source.
1. An integrated circuit including:
a plurality of circuit groups, each circuit group containing a plurality of analog inputs, a plurality of programmable analog switches, a buffer, and a sample/hold circuit, the buffer having a first input to which any of the analog inputs in its group may be programmably connected by selectively programming the programmable analog switches, each buffer having a first output programmably coupled by selectively programming the programmable analog switches to an first input of the sample/hold circuit in the group;
a multiplexer having a plurality of inputs, each input coupled to an output of a different one of the sample/hold circuits; and
an amplifier having an input coupled to an output of the multiplexer.
2. The integrated circuit of claim 1 wherein:
the amplifier has programmable gain.
3. The integrated circuit of claim 1 wherein:
the amplifier has programmable offset.
4. The integrated circuit of claim 1 wherein:
each circuit group further includes a comparator having inputs that can be programmably coupled to at least one analog input in the group.
5. The integrated circuit of claim 4 wherein:
at least one of the inputs of each comparator can be programmably coupled to a reference voltage source.
6. The integrated circuit of claim 1 wherein:
the buffer in each of the plurality of circuit groups having a second input to which any of the analog inputs of its group can be programmably connected by selectively programming the programmable analog switches.
7. The integrated circuit of claim 1 wherein:
the first input of each buffer can be programmably coupled by selectively programming the programmable analog switches to the first input of the sample/hold circuit in the group.
8. The integrated circuit of claim 7 wherein:
a second input of each buffer can be programmably coupled by selectively programming the programmable analog switches to the second input of the sample/hold circuit in the group.
9. The integrated circuit of claim 7 wherein:
a second output of each buffer can be programmably coupled by selectively programming the programmable analog switches to the second input of the sample/hold circuit in the group.