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US 6,642,790 B2Granted
Differential, complementary amplifier
AssigneeInfineon Technologies AG
InventorsKarl Schrödinger, Jaro Stimma
Life of this patent
Estimating the term…
Abstract
A differential amplifier has two amplifier paths. The second amplifier path is operated in the opposite direction relative to the first amplifier path. The outputs of the two amplifier paths form a differential output and are in each case connected to one another via a respective load resistor at a node. The operating point of the two amplifier paths is set by the voltage that is present at the node. The differential load is divided into two individual resistors and the voltage present between the individual resistors serves for setting the operating point of the amplifier paths. The bandwidth and the gain can be influenced by varying the resistances of the load resistors.
Claims25
A differential, complementary amplifier, comprising:
- a first complementary MOSFET amplifier path including a p-channel transistor and an n-channel transistor connected in series;
- a second complementary MOSFET amplifier path including a p-channel transistor and an n-channel transistor connected in series;
- a first load resistor and a second load resistor;
- and
- a node;
- said second amplifier path being operated in an opposite direction relative to said first amplifier path;
- said first amplifier path having an output;
- said second amplifier path having an output;
- said output of said first amplifier path and said output of said second amplifier path forming a differential output;
- said first load resistor connecting said output of said first amplifier path to said node;
- said second load resistor connecting said output of said second amplifier path to said node;
- said first amplifier path and said second amplifier path having an operating point set by a voltage present at said node
- at least a first FET control transistor and a second FET control transistor for controlling a current supplied to said first amplifier path and to said second amplifier path, said first FET control transistor having a gate terminal, said second FET control transistor having a gate terminal;
- a first low-pass filter connecting said node to said gate terminal of said first control transistor;
- and
- a second low-pass filter connecting said node to said gate terminal of said second control transistor.
13 more elements
A differential, complementary amplifier, comprising:
- a first complementary MOSFET amplifier path including a p-channel transistor and an n-channel transistor connected in series;
- a second complementary MOSFET amplifier path including a p-channel transistor and an n-channel transistor connected in series;
- a first load resistor and a second load resistor;
- and
- a node;
- said second amplifier path being operated in an opposite direction relative to said first amplifier path;
- said first amplifier path having an output;
- said second amplifier path having an output;
- said output of said first amplifier path and said output of said second amplifier path forming a differential output;
- said first load resistor connecting said output of said first amplifier path to said node;
- said second load resistor connecting said output of said second amplifier path to said node;
- said first amplifier path and said second amplifier path having an operating point set by a voltage present at said node;
- at least a first FET control transistor and a second FET control transistor for controlling a current supplied to said first amplifier path and to said second amplifier path;
- a first current mirror circuit including a MOSFET transistor having an input connected to said node;
- and
- a second current mirror circuit including a MOSFET transistor having an input connected to said node;
- said first control transistor having a source terminal;
- said second control transistor having a source terminal;
- said MOSFET transistor of said first current mirror circuit having an output connected to said source terminal of said first control transistor;
- said MOSFET transistor of said second current mirror circuit having an output connected to said source terminal of said second control transistor;
- said first current mirror circuit being assigned to said first control transistor;
- and
- said second current mirror circuit being assigned to said second control transistor.
20 more elements
A differential, complementary amplifier, comprising:
- a first complementary MOSFET amplifier path including a p-channel transistor and an n-channel transistor connected in series;
- a second complementary MOSFET amplifier path including a p-channel transistor and an n-channel transistor connected in series;
- a first load resistor and a second load resistor;
- and
- a node;
- said second amplifier path being operated in an opposite direction relative to said first amplifier path;
- said first amplifier path having an output;
- said second amplifier path having an output;
- said output of said first amplifier path and said output of said second amplifier path forming a differential output;
- said first load resistor connecting said output of said first amplifier path to said node;
- said second load resistor connecting said output of said second amplifier path to said node;
- said first amplifier path and said second amplifier path having an operating point set by a voltage present at said node;
- and
- a negative feedback device for said first amplifier path and for said second amplifier path.
11 more elements
Dependencies are inferred from the claim text.