Transient frequency in dynamic threshold metal-oxide-semiconductor field effect transistors
First Claim
1. An integrated circuit, comprising:
- a primary field-effect transistor formed in a surface of a semiconductor substrate, having a source-drain path, a gate, and a body node of a first conductivity type; and
a secondary field-effect transistor formed in the surface of the semiconductor substrate, having a source-drain path connected on one end to the gate of the primary transistor and connected on another end to the body node of the primary transistor, the secondary transistor having a gate biased so that the voltage of the body node of the primary transistor is higher when the gate of the primary transistor is at a voltage that turns on the primary transistor than when the gate of the primary transistor is at a voltage that turns off the primary transistor.
1 Assignment
0 Petitions
Accused Products
Abstract
An integrated circuit having a primary transistor (12, 22, 32, 42, 52) and an associated secondary transistor (15, 25, 35, 45, 55) for dynamically varying the voltage of the body node (B) of the primary transistor (12, 22, 32, 42, 52) responsive to the gate voltage of the primary transistor (12, 22, 32, 42, 52) is disclosed. According to the disclosed embodiments of the invention, each of the primary transistor (12, 22, 32, 42, 52) and secondary transistor (15, 25, 35, 45, 55) are bulk transistors, formed at a surface of a substrate (11), where the secondary transistor (15, 25, 35, 45, 55) has a much smaller channel width than that of the primary transistor (12, 22, 32, 42, 52), to enhance the transient frequency of the device. In each case, the secondary transistor (15, 25, 35, 45, 55) has its source-drain path connected between the gate (G) and the body node (B) of the primary transistor (12, 22, 32, 42, 52). According to some embodiments of the invention, the secondary transistors (15, 25) have their gates biased to a bias voltage corresponding to their conductivity type. According to other embodiments, the gate of the secondary transistor (35, 45, 55) is connected to one end of its source-drain path. The disclosed arrangements provide good on-state performance while minimizing off-state source-drain leakage, and maintaining excellent transient frequency performance.
-
Citations
15 Claims
-
1. An integrated circuit, comprising:
-
a primary field-effect transistor formed in a surface of a semiconductor substrate, having a source-drain path, a gate, and a body node of a first conductivity type; and
a secondary field-effect transistor formed in the surface of the semiconductor substrate, having a source-drain path connected on one end to the gate of the primary transistor and connected on another end to the body node of the primary transistor, the secondary transistor having a gate biased so that the voltage of the body node of the primary transistor is higher when the gate of the primary transistor is at a voltage that turns on the primary transistor than when the gate of the primary transistor is at a voltage that turns off the primary transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An integrated circuit, comprising:
-
a primary field-effect transistor formed in a surface of a semiconductor substrate, and having a source, a drain, a gate, and a body node of a first conductivity type;
a secondary field-effect transistor formed in a surface of a semiconductor substrate, and having a source-drain path connected on one end to the gate of the primary transistor and connected on another end to the body node of the primary transistor, the secondary transistor having a gate biased to a bias voltage corresponding to its conductivity type. - View Dependent Claims (11, 12, 13, 14, 15)
-
Specification