Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency
AssigneeDoble Engineering Company
InventorGeorge A. Cavigelli
Life of this patent
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Abstract
The invention features power amplifying apparatus with controllable frequency characteristic of the gain. The apparatus includes a band pass network of two cascaded amplifiers and multiple resistors and capacitors arranged to form multiple feedback loops. The feedback loops stabilize the output A.C. signals and establish a predetermined bandwidth of the network. The apparatus also includes a capacitor resistor feedback loop, connected to the output of the second amplifier and input of the first amplifier, with the capacitor and the resistor selected to maximize the loop gain at a desired frequency.
Claims15
Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency, said apparatus comprising:
- band pass network including first and second cascaded amplifiers,
- said amplifiers including multiple feedback loops with multiple resistors and capacitors,
- said feedback loops being constructed and arranged to stabilize the output A.C. signals and to establish predetermined bandwidth of said network,
- a capacitor-resistor feedback loop including a capacitor and a resistor connected in series,
- said capacitor-resistor feedback loop arranged to connect the output of the second amplifier and the input of the first amplifier, and
- the capacitor and the resistor of said capacitor-resistor feedback loop selected to maximize the loop gain of said amplifying apparatus at said desired frequency in said bandwidth.
Power amplifying apparatus for supplying A.C. signals having a maximum loop gain at a desired frequency, said apparatus comprising:
- a first operational amplifier, having inverting and noninverting inputs and an output, constructed and arranged to operate as an integrator,
- a second amplifier, having inverting and noninverting inputs and an output, constructed and arranged to operate as a power amplifier and cascaded with said first operational amplifier,
- a signal input node coupled to the noninverting input of said first operational amplifier,
- a signal output node coupled to the output of said second amplifier,
- a capacitor connected between said input node and the noninverting input of said first operational amplifier,
- a first feedback loop arranged to connect said output node and the noninverting input of said first amplifier,
- said first feedback loop including two resistors in series and a grounded capacitor forming a T-network, and
- a second feedback loop arranged to connect said output node to the noninverting input of said first amplifier,
- said second feedback loop including a capacitor and a resistor connected in series, and
- said capacitor and said resistor of said second feedback loop selected to establish the maximum of the loop gain of said amplifying apparatus at said desired frequency.
Dependencies are inferred from the claim text.