Multiplying and inverting charge pump
First Claim
Patent Images
1. A charge pump for production of first and second output voltages which are generated in first and second switching phases from an input voltage between first and second input terminals, comprising:
- a first pump capacitor having first and second plates;
a first switch network configured to couple;
a) said first pump capacitor'"'"'s first plate to said first input terminal and said first pump capacitor'"'"'s second plate to said second input terminal in said first switching phase, andb) said first pump capacitor'"'"'s second plate to said first input terminal in said second switching phase;
a second pump capacitor having first and second plates;
a second switch network configured to couple;
a) said second pump capacitor'"'"'s second plate to said first input terminal in said first switching phase, andb) said second pump capacitor'"'"'s first plate to said first pump capacitor'"'"'s first plate and said second pump capacitor'"'"'s second plate to said second input terminal in said second switching phase;
a third pump capacitor having first and second plates;
a first reservoir capacitor for storing said first output voltage, said first reservoir capacitor having first and second plates with said second plate coupled to said second input terminal;
a second reservoir capacitor for storing said second output voltage, said second reservoir capacitor having first and second plates with said second plate coupled to said second input terminal; and
a third switch network configured to couple;
a) said third pump capacitor'"'"'s first plate to said second pump capacitor'"'"'s first plate, said third pump capacitor'"'"'s second plate to said second input terminal and said first reservoir capacitor'"'"'s first plate to said second pump capacitor'"'"'s first plate in said first switching phase, andb) said third pump capacitor'"'"'s first plate to said second input terminal and said second reservoir capacitor'"'"'s first plate to said third pump capacitor'"'"'s second plate in said second switching phase.
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Abstract
With an input voltage Vin between first and second input terminals (24, 25), a charge pump (20) generates output voltages +3Vin and -3Vin at first and second output terminals (26, 28). The output voltages are generated in first and second switching phases. The charge pump includes first, second and third pump capacitors (36, 46, 56), switch networks (38, 48, 58) and reservoir capacitors (26, 28). It is particularly suited for implementation with MOS switching transistors.
72 Citations
30 Claims
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1. A charge pump for production of first and second output voltages which are generated in first and second switching phases from an input voltage between first and second input terminals, comprising:
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a first pump capacitor having first and second plates; a first switch network configured to couple; a) said first pump capacitor'"'"'s first plate to said first input terminal and said first pump capacitor'"'"'s second plate to said second input terminal in said first switching phase, and b) said first pump capacitor'"'"'s second plate to said first input terminal in said second switching phase; a second pump capacitor having first and second plates; a second switch network configured to couple; a) said second pump capacitor'"'"'s second plate to said first input terminal in said first switching phase, and b) said second pump capacitor'"'"'s first plate to said first pump capacitor'"'"'s first plate and said second pump capacitor'"'"'s second plate to said second input terminal in said second switching phase; a third pump capacitor having first and second plates; a first reservoir capacitor for storing said first output voltage, said first reservoir capacitor having first and second plates with said second plate coupled to said second input terminal; a second reservoir capacitor for storing said second output voltage, said second reservoir capacitor having first and second plates with said second plate coupled to said second input terminal; and a third switch network configured to couple; a) said third pump capacitor'"'"'s first plate to said second pump capacitor'"'"'s first plate, said third pump capacitor'"'"'s second plate to said second input terminal and said first reservoir capacitor'"'"'s first plate to said second pump capacitor'"'"'s first plate in said first switching phase, and b) said third pump capacitor'"'"'s first plate to said second input terminal and said second reservoir capacitor'"'"'s first plate to said third pump capacitor'"'"'s second plate in said second switching phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A charge pump for production of an output voltage which is generated in first and second switching phases from an input voltage between first and second input terminals, comprising:
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a first pump capacitor having first and second plates; a first switch network configured to couple; a) said first pump capacitor'"'"'s first plate to said first input terminal and said first pump capacitor'"'"'s second plate to said second input terminal in said first switching phase, and b) said first pump capacitor'"'"'s second plate to said first input terminal in said second switching phase; a second pump capacitor having first and second plates; a second switch network configured to couple; a) said second pump capacitor'"'"'s second plate to said first input terminal in said first switching phase, and b) said second pump capacitor'"'"'s first plate to said first pump capacitor'"'"'s first plate and said second pump capacitor'"'"'s second plate to said second input terminal in said second switching phase; a reservoir capacitor for storing said output, voltage, said reservoir capacitor having first and second plates with said second plate coupled to said second input terminal; and an output switch configured to couple said reservoir capacitor'"'"'s upper plate and said second pump capacitor'"'"'s upper plate in said first switching phase. - View Dependent Claims (14, 15, 16, 17)
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18. A charge pump for production of an output voltage which is generated in first and second switching phases from an input voltage between first and second input terminals, comprising:
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a first pump capacitor having first and second plates; a first switch network configured to couple; a) said first pump capacitor'"'"'s first plate to said first input terminal and said first pump capacitor'"'"'s second plate to said second input terminal in said first switching phase, and b) said first pump capacitor'"'"'s second plate to said first input terminal in said second switching phase; a second pump capacitor having first and second plates; a second switch network configured to couple; a) said second pump capacitor'"'"'s second plate to said first input terminal in said first switching phase, and b) said second pump capacitor'"'"'s first plate to said first pump capacitor'"'"'s first plate and said second pump capacitor'"'"'s second plate to said second input terminal in said second switching phase; a third pump capacitor having first and second plates; a reservoir capacitor for storing said output voltage, said reservoir capacitor having first and second plates with said second plate coupled to said second input terminal; and a third switch network configured to couple; a) said third pump capacitor'"'"'s first plate to said second pump capacitor'"'"'s first plate and said third pump capacitor'"'"'s second plate to said second input terminal in said first switching phase, and b) said third pump capacitor'"'"'s first plate to said second input terminal and said reservoir capacitor'"'"'s first plate to said third pump capacitor'"'"'s second plate in said second switching phase. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A charge pump, comprising:
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an input terminal; first, second and third pump capacitors; first and second reservoir capacitors for storing first and second output voltages; a switching network configured during a first switching phase to charge said first pump capacitor from said input terminal, and to charge both said third pump capacitor and said first reservoir capacitor from a series connection of said input terminal and said second pump capacitor, and configured during a second switching phase to charge said second pump capacitor from a series connection of said input terminal and said first pump capacitor, and to inversely charge said second reservoir capacitor from said third pump capacitor. - View Dependent Claims (26)
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27. A charge pump, comprising:
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an input terminal; first and second pump capacitors; a reservoir capacitor for storing an output voltage; a switching network configured during a first switching phase to charge said first pump capacitor from said input terminal, and to charge said reservoir capacitor from a series connection of said input terminal and said second pump capacitor, and configured during a second switching phase to charge said second pump capacitor from a series connection of said input terminal and said first pump capacitor. - View Dependent Claims (28, 29)
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30. A charge pump, comprising:
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an input terrain first, second and third pump capacitors; a reservoir capacitor for storing an output voltage; a switching network configured during a first switching phase to charge said first pump capacitor from said input terminal, and to charge said third pump capacitor from a series connection of said input terminal and said second pump capacitor, and configured during a second switching phase to charge said second pump capacitor from a series connection of said input terminal and said first pump capacitor, and to inversely charge said reservoir capacitor from said third pump capacitor.
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Specification