US 2017/0257098 A1Published application

Differential driver with pull up and pull down boosters

AssigneeTexas Instruments Incorporated

InventorsWeicheng Zhang, Huanzhang Huang, Yanli Fan, Roland Sperlich

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Abstract

A driver includes first and second resistors coupled to a supply voltage and coupled to pairs of main transistors at positive and negative output nodes. The first and second pairs of main transistors provide emphasis and de-emphasis on the positive and negative output nodes. The driver also includes a delay inverter, a pull up booster and a pull down booster. The delay inverter delays and inverts each of a pair of differential input signals to provide delayed and inverted differential signals. The pull up booster provides a bypass current path that bypasses the first and second resistors but includes at least some of the first and second pairs of main transistors. The pull down booster provides an additional current path from the supply voltage through the first or second resistor to ground.

Claims17

Dependent claims

A differential driver, comprising:

a first resistor coupled to a supply voltage node and to a first pair of main transistors at a positive output node of the differential driver;
a second resistor coupled to the supply voltage node and to a second pair of main transistors at a negative output node of the differential driver;
a pull up booster having at least one differential input terminal and a differential output terminal, the at least one differential input terminal coupled to a gate terminal of a first transistor of the first pair of main transistors and to a gate terminal of a first transistor of the second pair of main transistors, the differential output terminal coupled to the positive output node and the negative output node of the differential driver, the pull up booster providing a bypass current path that bypasses the first and second resistors but includes at least some of the first and second pairs of main transistors;
and
a pull down booster having at least one differential input terminal and a differential output terminal, the at least one differential input terminal coupled to the gate terminal of the first transistor of the first pair of main transistors via an analog inverter and coupled to the gate terminal of the first transistor of the second pair of main transistors via the analog inverter, the differential output terminal coupled to the positive and negative output nodes of the differential driver, the pull down booster providing an additional current path from the supply voltage through the first or second resistor to ground, the additional current path is in addition to a current path from the supply voltage through the first or second resistor and at least some of the first and second pairs of main transistors.

2 more elements

A differential driver, comprising:

a first resistor coupled to a supply voltage node and to a first pair of main transistors at a positive output node of the differential driver;
a second resistor coupled to the supply voltage node and to a second pair of main transistors at a negative output node of the differential driver;
and
a pull up booster having at least one differential input terminal and a differential output terminal, the at least one differential input terminal coupled to a gate terminal of a first transistor of the first pair of main transistors and to a gate terminal of a first transistor of the second pair of main transistors, the differential output terminal coupled to the positive output node and the negative output node of the differential driver, the pull up booster providing a bypass current path that bypasses the first and second resistors but includes at least some of the first and second pairs of main transistors.

1 more element

A differential driver, comprising:

a first resistor coupled to a supply voltage node and to a first pair of main transistors at a positive output node of the differential driver;
a second resistor coupled to the supply voltage node and to a second pair of main transistors at a negative output node of the differential driver;
and
a pull down booster having at least one differential input terminal and a differential output terminal, the at least one differential input terminal coupled to a gate terminal of a first transistor of the first pair of main transistors via an analog inverter and coupled to a gate terminal of a first transistor of the second pair of main transistors via the analog inverter, the differential output terminal coupled to the positive and negative output nodes of the differential driver, the pull down booster providing an additional current path from the supply voltage through the first or second resistor to ground, the additional current path is in addition to a current path from the supply voltage through the first or second resistor and at least some of the first and second pairs of main transistors.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/600,378Filed 19 May 2017
Priority: 23 Sep 2014
Published: 7 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H03K 19/0944
Using field-effect transistors: using MOSFET or insulated gate field-effect transistors, i.e. IGFET
H03K 19/018578
Of complementary type, e.g. CMOS: with at least one differential stage
H03K
Pulse technique

Family

Application62/054,196Us provisional application · filed 23 Sep 2014
Application14/847,264Continuation · filed 8 Sep 2015
Application15/600,378Continuation
US 10,298,238 B2Related patent
US 2016/0087633 A1Published application
US 9,660,652 B2Related patent
US 2017/0257098 A1This patent

From the US filing history. Foreign family members aren’t listed.

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