Nested ammeter
AssigneeKeithley Instruments, LLC
InventorWayne C. Goeke
Life of this patent
Estimating the term…
Abstract
A nested ammeter for measuring the electrical current flowing through a device under test (DUT) can include an input configured to receive an input signal having a frequency within a frequency band and representing the electrical current flowing through the DUT. The nested ammeter can also include an output configured to generate an output voltage representing the electrical current flowing through the DUT. An active shunt can be used as the resistive feedback of the ammeter. A nested active shunt can be used as the resistive feedback element of the active shunt.
Claims13
An ammeter for measuring current flowing through a device under test (DUT), the nested ammeter comprising:
- an input configured to receive an input signal having a frequency within a frequency band and representing the current flowing through the DUT;
- an output configured to generate an output voltage representing the current flowing through the DUT;
- a first operational amplifier (op-amp) electrically coupled between the input and the output;
- and
- a first active shunt electrically coupled with the first op-amp and used as a resistive feedback element for the ammeter.
An ammeter for measuring current flowing through a device under test (DUT), the nested ammeter comprising:
- an input configured to receive an input signal having a frequency within a frequency band and representing the current flowing through the DUT;
- an output configured to generate an output voltage representing the current flowing through the DUT;
- a first operational amplifier (op-amp) electrically between the input and the output;
- an active shunt electrically coupled with the first op-amp and used as a resistive feedback element for the ammeter;
- and
- n nested active shunts within the active shunt, wherein each nested active shunt being one order higher than an other nested active shunt is used as a resistive feedback element for the other nested active shunt.
Dependencies are inferred from the claim text.