COMPARATOR WITH CONTROLLED CURRENT SUPPLY CAPACITY

摘要

A comparator includes an input-stage circuit that sets, in a first operating state, two voltage signals in a first voltage state, and changes, in a second operating state, the two voltage signals from the first voltage state to a second voltage state at different speeds, a latch-stage circuit that includes two field effect transistors and two inverters, the two field effect transistors receiving the two voltage signals at control nodes and disposed between two output nodes and a predetermined potential, the two inverters cross-coupled between the two output nodes and placed in an inactive state in the first operating state and in an active state in the second operating state, and a control circuit that controls current capacities in two paths through which drive voltages are applied to the two inverters, causing the current capacities to be different during at least part of a period of the second operating state.

主权项

1. A comparator, comprising:
an input-stage circuit configured to set, in a first operating state, two voltage signals in a first voltage state, and to change, in a second operating state, the two voltage signals from the first voltage state to a second voltage state at respective different speeds whose difference is responsive to a difference between voltage levels of two input signals; a latch-stage circuit that includes two field effect transistors and two inverters, the two field effect transistors receiving the two voltage signals at respective control nodes thereof and disposed between two respective output nodes and a node of a predetermined potential, the two inverters being cross-coupled between the two output nodes, and the two inverters being placed in an inactive state in the first operating state and placed in an active state in the second operating state; and a control circuit configured to control current supply capacities in two paths through which drive voltages are applied to the two inverters separately from each other, wherein the control circuit is configured to cause the current supply capacities in the two paths to be different from each other during at least part of a period of the second operating state.