Current mirror based write driver

A circuit for operating inductive recording heads comprising:

• an inductive recording means for magnetically recording data;
• first write driver means comprising first and second FETs, said inductive recording means coupled between first and second outputs of said first write driver means, said first and second outputs of said first write driver means being selectably enabled by first and second input signals;
• second write driver means comprising switching means and first and second current mirror means, said second write driver means having first and second inputs coupled to said first and second outputs of said first write driver means, respectively, said first and second input signals provided to said second write driver means for selectably sinking current through said first and second inputs of said second write driver means;
• and
• a bandgap current source coupled to said second write driver means.

A circuit for operating inductive recording heads comprising:

• an inductive recording means for magnetically recording data;
• first write driver means comprising first and second FETs, said inductive recording means coupled between first and second outputs of said first write driver means;
• second write driver means comprising first and second current mirror means, said second write driver means having first and second inputs coupled to said first and second outputs of said first write driver means, respectively;
• third and fourth current mirror means coupled to said second write driver means;
• switching means coupled to said third and fourth current mirror means and to said first write driver means, said first and second input signals provided to said switching means for selectably sinking current through said first and second inputs of said second write driver means and for selectably enabling said first and second outputs of said first write driver means;
• and,
• a bandgap current source coupled to said switching means.

A circuit for operating inductive recording heads comprising:

• an inductive recording means for magnetically recording data;
• first write driver means comprising first and second FETs, said inductive recording means coupled between first and second outputs of said first write driver means, said first and second outputs of said first write driver means being selectably enabled by first and second input signals;
• second write driver means comprising first and second current mirror means, said second write driver means having first and second inputs coupled to said first and second outputs of said first write driver means, respectively;
• switching means coupled to said second write driver means, said first and second input signals provided to said switching means for selectably sinking current through said first and second inputs of said second write driver means;
• and,
• a bandgap current source coupled to said second write driver means.