Rf circuit, circuit evaluation method, algorithm and recording medium
AssigneeNEC Corporation
InventorTakashi Inoue
Life of this patent
Estimating the term…
Abstract
It is required to qualitatively design a circuitry device in which not only in a small-signal simulation but also in a large-signal simulation, loop oscillation and motorboating oscillation of an amplifier are precisely predicted to suppress oscillation without severing a loop or without inserting a circulator. To remove insertion loss due to a probe resistor Rx, a negative resistor −Rx/2 is arranged at both ends thereof. To prevent consumption of a DC bias in the probe, a DC block is applied. Further, to remove thermal noise caused by an actual resistor to reduce influence on a noise factor NF, the noise temperature (environmental temperature) of the actual resistor is set to zero Kelvin.
Claims18
An RF circuit on a circuit simulator to be used in a microwave or millimeter wave range or a high-frequency range, comprising
- a function for being inserted by a first port and a second port thereof in a circuit to be observed, at an arbitrary cross-sectional point of the circuit, and evaluating a reflection coefficient (or a characteristic impedance) in the cross section, wherein insertion loss between the first port and the second port is zero or approximately zero and is ignorable also for any finite system impedance other than zero.
Dependencies are inferred from the claim text.