Level shifter
AssigneeST-Ericsson SA
InventorWillem Groeneweg
Life of this patent
Estimating the term…
Abstract
A level shifter (21) comprises a first stage (22) and a second stage (23). The first stage (22) comprises first and second inputs (34, 35) and is configured to generate a first signal (37) which indicates in a first state if either at least one of at least two first power voltages (Vdig, Vdda) provided for circuitries (38, 39) is unavailable or in a second state if each of the first power voltages (Vdig, Vdda) is available at the first and second inputs (34, 35). The second stage (23) comprises an output (51-54) and is configured to switch a second power voltage (Vbat) through to be present at the output (51-54) only if the first signal (37) is in its second state.
Claims8
A level shifter, comprising
- a first stage (22) comprising first and second inputs (34, 35) and configured to generate a first signal (37) which indicates in a first state if either at least one of at least two first power voltages (Vdig, Vdda) provided for circuitries (38, 39) is unavailable or in a second state if each of the first power voltages (Vdig, Vdda) is available at the first and second inputs (34, 35), and
- a second stage (23) comprising an output (51-54) and configured to switch a second power voltage (Vbat) through to be present at the output (51-54) only if the first signal (37) is in its second state.
Dependencies are inferred from the claim text.