Dual path operational amplifier
OwnerTakashi Naritainventor
Life of this patent
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Abstract
An operational amplifier has two paths, a high frequency path and a low frequency path. In addition, it has three main sections of stages. A stage converts input voltage to an amplified output voltage, a stage converting an input voltage in to an output current and a final stage where the outputs of the two previous sections are supplied as inputs. Among them, the final stage acts as a voltage follower to a signal applied to its plus (+) input and as a transimpedance amplifier for a signal applied to its minus input (−). In this configuration, a path for low frequencies and a path for high frequencies are created in a single operational amplifier.
Claims17
A dual path operational amplifier, comprising
- a path for low frequency;
- a path for high frequency;
- said high frequency being higher than said low frequency;
- said dual path operational amplifier being defined into three sections, a first section, a second section and a third section;
- said first section converting a first input voltage to a first amplified output voltage;
- said third section comprising a third amplifier;
- said third amplifier comprising a plus port and a minus port;
- said first amplified output voltage being a third A input to said plus port of said third amplifier;
- and
- a second voltage corresponding to said second section being a third B input to said minus port of said third amplifier.
A dual path operational amplifier, comprising
- a path for low frequency;
- a path for high frequency;
- said high frequency being higher than said low frequency;
- a voltage follower;
- a transimpedance amplifier;
- said voltage follower being used to create said path for low frequency;
- said transimpedance amplifier being used to create said path for high frequency;
- said voltage follower being a unity gain buffer;
- and
- a voltage gain of said unity gain buffer being unity;
- said voltage follower providing a current gain;
- and
- said voltage follower providing a power gain.
A dual path operational amplifier, comprising
- a path for low frequency;
- a path for high frequency;
- said high frequency being higher than said low frequency;
- a voltage follower;
- a transimpedance amplifier;
- said voltage follower being used to create said path for low frequency;
- said transimpedance amplifier being used to create said path for high frequency;
- said voltage follower being a unity gain buffer;
- and
- a voltage gain of said unity gain buffer being unity;
- said voltage follower providing a current gain;
- said voltage follower providing a power gain;
- said transimpedance amplifier converting an input voltage of said transimpedance amplifier into an output current of said transimpedance amplifier;
- said transimpedance amplifier further comprising a feedback resistor;
- said feedback resistor being defined as Rf;
- and
- a gain of transimpedance amplifier being −Rf.
Dependencies are inferred from the claim text.